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• The only way President Biden steps aside, despite his debate debacle, is if the same small group of lifelong loyalists who enabled his run suddenly — and shockingly — decides it’s time for him to call it quits.

Why it matters: Dr. Jill Biden; his younger sister, Valerie Biden; and 85-year-old Ted Kaufman, the president’s longtime friend and constant adviser — plus a small band of White House advisers — are the only Biden deciders.

There’s no official mechanism to kick Biden off the ticket if he doesn’t step down voluntarily, but the delegates who will vote to formally select a nominee at the party’s convention in August could revolt against him and select another candidate in his place.

Biden has swept the primaries, winning nearly 3,900 of the party’s 4,000 “pledged” delegates who will vote to formalize the nominee, and party rules require them to “in good conscience reflect the sentiments of those who elected them.”

A revolt is unlikely: Pledged delegates are not legally beholden to voting for Biden, but they’re generally loyalists of the party’s chosen nominee who are elected at state party conventions, in primaries or caucuses with heavy influence from the campaign of the party’s preferred candidate.

If Biden, or any candidate, fails to win a majority of pledged delegates on the first ballot at the convention, voting will continue until somebody wins an outright majority, with pledged delegates free to vote for whoever they want in later ballots.

The 700-some unpledged “superdelegates,” elected officials and party leaders who can vote for anyone they please, will also be allowed to vote on the second ballot (party rules prohibit them from voting on the first ballot).

If Biden voluntarily steps aside before the convention, his pledged delegates would be free to vote for an alternative candidate in an “open convention”—likely setting the stage for intense negotiations as other Democratic politicians angle to replace Biden.

If Biden steps aside after the convention, the Democratic National Committee’s approximately 500 members could call a special meeting to choose a new presidential and vice presidential nominee by majority vote.

Havana syndromeOther namesAnomalous health incidents^[1]
Unexplained health incidents^[2]
Unidentified health incidents^[3]The Hotel Nacional in Havana is one of the locations where the syndrome has reportedly been experienced.^[4]Symptoms

Acute^[5]

• Sudden onset of a perceived loud sound
• Visual disturbances
• Sensation of intense pressure or vibration in the head
• Pain in the ear or more diffusely in the head
• Cognitive problems

Chronic^[5]

• Balance and vestibular problems
• Vision and oculomotor problems
• Auditory problems
• Insomnia

CausesNot determined^[5][6]

Havana syndrome (also known as “anomalous health incidents“^[1][7]) is a disputed medical condition reported primarily by U.S. diplomatic, intelligence, and military officials stationed in overseas locations. Most of the affected individuals reported an acute onset of symptoms associated with a perceived localised loud sound, followed by chronic symptoms that lasted for months, such as balance and cognitive problems, insomnia, and headaches.^[5][6] The first cases were reported by U.S. and Canadian embassy staff in Havana, Cuba, though earlier incidents may have occurred in Frankfurt, Germany.^[8] Starting in 2016 through to 2021, several hundred U.S. intelligence and military officials and their families reported having symptoms in overseas locations including China, India,^[9] Europe, Hanoi, as well as in Washington, D.C., USA.^[10]

The cause of Havana syndrome remains unknown and controversial.^[5][6] In 2019 and 2020, some U.S. government representatives attributed the incidents to attacks by unidentified foreign actors,^[11] and various U.S. officials blamed the reported symptoms on a variety of unidentified and unknown technologies, including ultrasound or microwave weapons.^[12] The U.S. intelligence services could not determine the cause of the symptoms; however, U.S. intelligence and government officials expressed suspicions to the press that Russian military intelligence was responsible.^[13][14][15]

Beginning in 2022, several major studies were published with none finding any evidence of the reported conditions being the result of actions by a hostile power; some cited psychogenic factors, environmental causes, or pre-existing medical conditions as potential causes of the disease. In January 2022, the Central Intelligence Agency issued an interim assessment concluding that the syndrome is not the result of “a sustained global campaign by a hostile power.” Foreign involvement was ruled out in 976 cases of the 1,000 reviewed.^[16][17] In March 2023, seven U.S. intelligence agencies completed a review of the proposed cases of Havana syndrome and released an unclassified report with the consensus that “available intelligence consistently points against the involvement of US adversaries in causing the reported incidents” and that a foreign adversary’s involvement was “very unlikely”.^[18][19] This stance was reiterated in a March 2024 report by the National Intelligence Council.^[20]

Signs and symptoms

Most of the affected individuals reported an acute onset of neurological symptoms associated with a perceived localized loud sound such as screeching, chirping, clicking, or piercing noises.^[5][6] Two-thirds experienced visual disturbances such as blurred vision and sensitivity to light. More than half reported intense pressure or vibration in the head, ear pain, diffuse head pain, and cognitive problems such as forgetfulness and poor concentration. Tinnitus and hearing loss occurred in one-third of cases, and dizziness or unsteady gait affected one-quarter.^[5] Physical examinations have revealed abnormalities with balance and other neurological tests.^[5][6]

Some affected individuals develop chronic symptoms that last for months, such as balance and cognitive problems, insomnia, and headaches. The longevity of symptoms is not yet clear, and they are less specific than are the acute symptoms.^[5][6]

Causes

A review article published on August 2022 by Asadi-Pooya AA explored the scientific literature on Havana syndrome, proposing several possible causes for the condition. The review stated that a plausible explanation given was the use of a directed-energy or radio frequency weapon, with other potential causes including functional disorders, psychogenic disease, or exposure to chemicals/neurotoxins.^[5]

A subsequent review in December 2023 by Bartholomew RE and Baloh RW stated that Havana syndrome is a health scare fueled by “moral panic”. They suggested it was “a socially constructed catch-all category for an array of pre-existing health conditions, responses to environmental factors, and stress reactions that were lumped under a single label”.^[21]

Locations

Cuba

The U.S. Embassy in Havana, Cuba

In August 2017, reports began surfacing that American and Canadian^[22] diplomatic personnel in Cuba had experienced unusual, unexplained health problems dating to late 2016.^[23][24] As of June 2018, the number of American citizens experiencing symptoms was 26.^[25]

Events

The original 21 events in Cuba were characterized as starting with strange grating noises coming from a specific direction. Some people experienced pressure, vibration, or a sensation comparable to driving a car with the window partly rolled down. These noises lasted from 20 seconds to 30 minutes and happened while the diplomats were either at home or in hotel rooms. Other people nearby (including family members and guests in neighboring rooms) did not experience the same symptoms.^[26]

Impact on American diplomats

Some U.S. embassy workers have experienced lasting health problems, including an unidentified diplomat who now needs a hearing aid.^[27] In 2017, the U.S. State Department concluded that the health problems were either the result of an attack or due to exposure to an unknown device,^[28] but that it was not blaming the Cuban government, and would not say who was to blame.^[29] Affected people described symptoms such as hearing loss, memory loss, and nausea.^[28] Speculation centered around a sonic weapon,^[30] with some researchers pointing to infrasound as a possible cause.^[31]

In August 2017, the United States expelled two Cuban diplomats in retaliation for perceived Cuban responsibility.^[23] The next month, the U.S. State Department stated that it was removing non-essential staff from the U.S. embassy and warned U.S. citizens not to travel to Cuba.^[32] In October 2017, President Donald Trump said he believed that Cuba was responsible for the occurrences,^[33] calling them a “very unusual attack”.^[34]

In response to the incidents, the U.S. State Department announced in March 2018 that it would continue to staff its embassy in Havana at the minimum level required to perform “core diplomatic and consular functions”; the embassy had been operating under “ordered departure status” since September 2017, but the status was set to expire. This announcement served to extend the staff reductions indefinitely.^[35]

Impact on Canadian diplomats

In March 2018, some Canadian diplomats traveled to Pittsburgh to consult with the neurologist that had previously diagnosed brain issues in US diplomats. The neurologist concluded that MRIs of the Canadians showed evidence of brain damage that was similar to what the neurologist reported for the American counterparts. In early 2018, Global Affairs Canada ended family postings to Cuba and withdrew all staff with families. Several of the Canadians who were affected in 2017 were reported to still be unable to resume their work due to the severity of their ailments. The lack of knowledge of the cause of Havana syndrome, as of February 2019^[update], had made it challenging for the Royal Canadian Mounted Police to investigate.^[36]

In 2019, the Canadian government announced that it was reducing its embassy staff in Havana after a 14th Canadian diplomat reported symptoms of Havana syndrome in late December 2018.^[37] In February 2019, several Canadian diplomats sued the Canadian government, arguing that it failed to protect them or promptly address serious health concerns.^[38][39] The government has sought to dismiss the suit, arguing in November 2019 that it was not negligent and did not breach its duties to its employees. In court filings, the government acknowledged that several of the 14 plaintiffs in the suit had concussion-like symptoms but said that no definitive cause or medical diagnosis had been ascertained.^[40] In a November 2019 statement, Global Affairs Canada said, “We continue to investigate the potential causes of the unusual health symptoms.”^[40]

Cuban government reactions

After the incident was made public, the Cuban foreign minister accused the U.S. of lying about the incident and denied Cuban involvement in or knowledge of the cause of the health problems the diplomats experienced.^[41][42]

The Cuban government offered to cooperate with the U.S. in an investigation of the incidents.^[43] It employed about 2,000 scientists and law enforcement officers who interviewed 300 neighbors of diplomats, examined two hotels, and medically examined non-diplomats who could have been exposed. NBC reported that Cuban officials stated that they analyzed air and soil samples and considered a range of toxic chemicals. They also examined the possibility that electromagnetic waves were to blame, and even looked into whether insects could be the culprit, but found nothing they could link to the claimed medical symptoms. The FBI and Cuban authorities met to discuss the situation; the Cubans stated that the U.S. neither agreed to share the diplomats’ medical records with Cuban authorities nor allowed Cuban investigators access to U.S. diplomats’ homes to conduct tests.^[44] In 2021, a panel of 16 scientists affiliated with the Cuban Academy of Sciences and convened by the Cuban government reported that “the narrative of the ‘mysterious syndrome’ is not scientifically acceptable in any of its components.” The panel addressed the microwave hypothesis directly, writing, “No known form of energy can selectively cause brain damage (with laser-like spatial accuracy) under the conditions described for the alleged incidents in Havana.”^[45]

Upon release of the March 2023 U.S. intelligence agencies’ unclassified report which concluded that “available intelligence consistently points against the involvement of US adversaries in causing the reported incidents” and that a foreign adversary’s involvement was “very unlikely”, Cuba’s Vice Foreign Minister Carlos Fernandez de Cossio told Reuters, “The unfortunate thing is the U.S. government leveraged [Havana syndrome] to derail bilateral relations … and discredit Cuba.” Reuters went to report that “Cuba has for years labeled as ‘science fiction’ the idea that ‘Havana Syndrome’ resulted from an attack by a foreign agent, and its top scientists in 2021 found no evidence of such allegations.”^[46]

Beyond Cuba

Beginning in late 2017, suspected attacks targeting U.S. intelligence personnel were reported in an expanding set of locations around the world,^[10] including Moscow, Russia; Tbilisi, Georgia; Poland; Taiwan; and Australia.^[47] Other reports came from Colombia, Kyrgyzstan, Uzbekistan, and Austria,^[15] among other countries.^{[15][48][49][12][50][51][52]}

The U.S. government has not released the number of affected persons, but media reporting indicated a total of 130 possible cases by the end of May 2021,^[15] rising to more than 200 by mid-September 2021.^[13] The cases variously affected CIA, U.S. military, and State Department personnel and their family members.^[15] Some reports, after investigation, were determined to be possibly related to Havana syndrome, while others were determined to be unrelated; BBC News reported in 2021 that “One former official reckons around half the cases reported by US officials are possibly linked to attacks by an adversary.”^[53]

China

Consulate General of the United States in Guangzhou

Starting in early 2018, U.S. diplomats in China began reporting symptoms consistent with Havana syndrome. The first such incident was reported by an American diplomat in China in April 2018 at the Guangzhou consulate, the largest U.S. consulate in China. The employee reported that he had been experiencing symptoms since late 2017. Several individuals were taken to the U.S. for medical examination.^[54][55][56] A USAID employee at the U.S. embassy in Tashkent, Uzbekistan, reported a different incident in September 2017; the employee’s report was discounted by the U.S. State Department.^[57]

Answering questions from the House Foreign Affairs Committee in May 2018, Secretary of State Mike Pompeo testified that U.S. diplomatic staff in Guangzhou had reported symptoms “very similar” to, and “entirely consistent” with, those reported from Cuba.^[58][59] On June 6, 2018, The New York Times reported that at least two additional U.S. diplomats stationed at the Guangzhou consulate had been evacuated from China and reported that “it remains unclear whether the illnesses are the result of attacks at all. Other theories have included toxins, listening devices that accidentally emitted harmful sounds, or even mass hysteria.”^[55] In June 2018, the State Department announced that a task force had been assembled to investigate the reports^[60] and expanded their health warning to all of mainland China amid reports some US diplomats outside of Guangzhou had experienced the same symptoms resembling a brain injury.^[61] The warning told anyone who experienced “unusual acute auditory or sensory phenomena accompanied by unusual sounds or piercing noises” to “not attempt to locate their source”.^[62]

Elsewhere in Asia

In August 2021, it was reported that two American diplomats were evacuated from the U.S. Embassy in Hanoi, Vietnam, after incidents of Havana syndrome were reported.^[63] These reported cases also delayed Vice President Kamala Harris‘s visit to Vietnam.^[64][65]

In September 2021, an aide-de-camp of CIA director William J. Burns reported symptoms consistent with those of Havana syndrome on a diplomatic visit to India.^[52]

Washington, D.C. area

In 2019, a White House official reported experiencing debilitating symptoms while walking her dog in a Virginia suburb of Washington; the incident was publicly reported in 2020.^[12] In November 2020, a similar incident was reported on The Ellipse, a lawn adjacent to the south side of the White House.^[12][66] Both incidents were similar to those that were reported to have struck dozens of U.S. personnel overseas, including CIA and State Department personnel.^[12] Federal agencies investigated the incident at The Ellipse, and Defense Department officials briefed members of the Senate Armed Services Committee and House Armed Services Committee in April 2021.^[12] Investigators told members of Congress that they had not been able to determine the cause of the events or who was responsible.^[12]

Europe

U.S. embassy in Vienna, Austria

In 2021, dozens of U.S. personnel stationed in Vienna, including diplomats, intelligence officials, and some children of U.S. employees, had Havana syndrome-like symptoms.^[11]
The State Department confirmed in July 2021 that it was investigating the reports.^[67] The Austrian foreign ministry stated it was collaborating with American investigators. Aside from Havana, Vienna has reported the most incidents. While no suspects were named for the Vienna cases, it has been noted that Vienna was hosting indirect talks between the United States and Iran on reviving the 2015 Iran deal.^[68] In September 2021, the CIA station chief in Vienna (the top U.S. intelligence officer in the country) was recalled over concerns over his management; he had been criticized for not taking quicker action in response to the Havana syndrome cases at his post.^[13][11]

In the months preceding August 2021, cases of Havana syndrome were reported at the U.S. embassy in Berlin, Germany, including from two U.S. officials who sought medical treatment.^[69] Several new cases were reported at the embassy in October 2021.^[70]

In 2021, the CIA evacuated an intelligence officer serving in Serbia suspected of being a victim of the neurological attack.^[10]

Three White House staffers reported symptoms at the InterContinental London Park Lane in late May 2019.^[15]

Elsewhere

One of the CIA officials with symptoms in Australia and Taiwan was one of the agency’s top five officials.^[47] The Russian embassy in Australia dismissed reports of Russian operatives targeting CIA personnel in Australia.^[71]

In October 2021, it was reported that U.S. embassy personnel and their families in Bogota, Colombia, had developed symptoms consistent with Havana syndrome.^[72][73]

Chronology of investigation

2018

In January 2018, at Secretary of State Rex Tillerson‘s direction, the State Department convened an accountability review board,^[74] which is “an internal State Department mechanism to review security incidents involving diplomatic personnel”.^[75] Retired United States Ambassador to Libya Peter Bodde was chosen to lead the board.^[75] Also in January, the Associated Press reported that a non-public FBI report found no evidence of an intentional sonic attack.^[76]

In March 2018, Kevin Fu and a team of computer scientists at the University of Michigan reported in a study that ultrasound—specifically, intermodulation distortion from multiple inaudible ultrasonic signals—from malfunctioning or improperly placed Cuban surveillance equipment could have been the origin of the reported sounds.^[77][78][79]

A 2018 State Department report was declassified and posted on the George Washington University‘s National Security Archive after Freedom of Information Act litigation brought by the James Madison Project. The documents indicate that the State Department botched the handling of the initial reports. Peter Kornbluh of the National Security Archive noted that the 2018 report concluded that the department’s “initial investigation assessment of what was going on” was marred by chaos, disorganization, and excessive secrecy.^[80]

A November 2018 report in The New Yorker found that the FBI’s investigation into the incidents was stymied by conflict with the CIA and the State Department; the CIA was reluctant to reveal, even to other U.S. government agencies, the identities of affected officers because of concern about possible leaks. Federal rules on the privacy of employee medical records also hindered the investigation.^[48]

JAMA report

At the U.S. government’s request, University of Pennsylvania researchers examined 21 affected diplomats posted to Cuba, and the preliminary results were published in the Journal of the American Medical Association (JAMA) in March 2018. The researchers found “no evidence of white matter tract abnormalities” in affected diplomats beyond what might be seen in a control group of the same age, but described “a new syndrome in the diplomats that resembles persistent concussion“.^[81][82] While some of those affected recovered swiftly, others had symptoms for months. The study concluded that “the diplomats appear to have sustained injury to widespread brain networks.”^[81][82]

In 2018, Douglas H. Smith, the lead author of a University of Pennsylvania study of 21 affected diplomats in Havana published in JAMA, said in an interview that microwaves were “considered a main suspect” underlying the phenomenon.^[83] A 2018 study published in the journal Neural Computation by Beatrice Alexandra Golomb rejected the idea that a sonic attack was the source of the symptoms and concluded that the facts were consistent with pulsed radiofrequency^[84]/microwave radiation (RF/MW) exposure. Golomb wrote that (1) the nature of the noises the diplomats reported was consistent with sounds caused by pulsed RF/MW via the Frey effect; (2) the signs and symptoms the diplomats reported matched symptoms from RF/MW exposure (problems with sleep, cognition, vision, balance, speech; headaches; sensations of pressure or vibration; nosebleeds; brain injury and brain swelling); (3) “oxidative stress provides a documented mechanism of RF/MW injury compatible with reported signs and symptoms”; and (4) in the past, the U.S. embassy in Moscow was subject to a microwave beam called the Moscow Signal.^[85] The Moscow Signal was inferred to be a Soviet espionage technique that might have also had health effects.^[86] Neuroscientist Allan H. Frey, for whom the Frey effect is named, considers the microwave theory viable.^[83]

A March 2018 editorial in JAMA by two neurologists argued that a functional disorder such as persistent postural-perceptual dizziness (“a syndrome characterized primarily by chronic symptoms of dizziness and perceived unsteadiness, often triggered by acute or chronic vestibular disease, neurological or medical illness or psychological distress”) could explain some of the symptoms the diplomats in Cuba experienced.^[87]

The editorial board of the journal Cortex published an editorial referring to the JAMA research’s “gross methodological flaws” and registering concern that it had been published. In the board’s view, “Allowing such confused and conflicting explanations of methodology and analysis to pass unchallenged is a slippery path for science, and dangerous for society at large”.^[88]

As early as 2018, some scientists, including physicist Peter Zimmerman, bioengineers Kenneth R. Foster, and Andrei G. Pakhomov, and UCLA neurologist Robert Baloh, said that the microwave hypothesis was implausible; Baloh called the JAMA conclusion “science fiction”.^[89][90]

JASON report

In 2018, JASON, a group of physicists and scientists who advise the U.S. government, analyzed audio recordings from eight of the original 21 incidents of Havana syndrome and two cellphone videos taken by one patient from Cuba. It concluded that the sounds in the eight recordings were “most likely” caused by insects and that it was “highly unlikely” that microwaves or ultrasound beams were involved, because “No plausible single source of energy (neither radio/microwaves nor sonic) can produce both the recorded audio/video signals and the reported medical effects.”^[91] The group determined with “high confidence” that the two videos were sounds from the Indies short-tailed cricket, and also noted a “low confidence” hypothesis that the noises may have been from a concrete vibrating machine with worn bearings.^[91] The report’s findings were first reported by Reuters in July 2019.^[92] Parts of JASON’s report were declassified in September 2021.^[91] While biomedical engineer Kenneth Foster (an opponent of the microwave theory) cited the findings as evidence against the theory, biomedical engineer James Lin (a proponent of the microwave theory) wrote in an email to BuzzFeed News that the recordings the JASON report analyzed could not represent actual cases of Havana syndrome, since sound recorders cannot record microwaves.^[91] The JASON report also concluded, “It cannot be ruled out that while the perceived sounds, while not harmful, are introduced by an adversary as deception so as to mask an entirely unrelated mode of causing illness.”^[91] The report also concluded that while the cause of the condition was unknown, “psychogenic effects may serve to explain important components of the reported injuries”.^[91]

2019

In January 2019, biologists Alexander L. Stubbs of the University of California, Berkeley and Fernando Montealegre-Z of the University of Lincoln analyzed audio recordings made by American personnel in Havana during incidents associated with Havana syndrome.^[93] The conclusion was that the sounds were the calling song of the Indies short-tailed cricket (Anurogryllus celerinictus) rather than those of a technological device. Stubbs and Montealegre-Z matched the song’s “pulse repetition rate, power spectrum, pulse rate stability, and oscillations per pulse” to the recording.^[94][95] Stubbs and Montealegre wrote, “the causes of the health problems reported by embassy personnel are beyond the scope of this paper” and called for “more rigorous research into the source of these ailments, including the potential psychogenic effects, as well as possible physiological explanations unrelated to sonic attacks.”^[95] This conclusion was comparable to a 2017 hypothesis by Cuban scientists that the sound on the same recording is that of Jamaican field crickets.^{[94][96][97][98]}

In response to a December 2017 State Department request, the U.S. Centers for Disease Control and Prevention conducted a “Cuba Unexplained Events Investigation”.^[99][100] The two-year investigation of the medical records of 95 American diplomats and family members in Havana who reported symptoms resulted in a final report, marked for official use only, dated December 2019.^[101]

In a 2019 paper, Robert Bartholomew and Robert Baloh proposed that the syndrome represents mass psychogenic illness rather than a “novel clinical entity”.^[102] They cite the vagueness and inconsistency of symptoms as well as the circumstances they developed in (affected staff would have been under significant stress as the U.S. had just reopened its embassy in Cuba) as a cause.^[102][103]

2020

In October 2020, the New York Times reported that U.S. diplomats and intelligence officers, including senior leaders, had clashed with Trump administration appointees, including CIA director Gina Haspel and State Department leaders, over the nature and causes of the suspected attacks.^[80] A New York Times investigation found that the State Department had “produced inconsistent assessments of patients and events, ignored outside medical diagnoses and withheld basic information from Congress”.^[80] Despite the general view within the U.S. government that Russia was responsible, two U.S. officials told The New York Times that Haspel was not convinced of Russia’s responsibility, or even whether an attack occurred.^[80]

Many current and former U.S. officials stated that Russia was likely responsible for the alleged attacks,^[104] a suspicion shared by both Trump and Biden administration officials.^[15] This view was shared by CIA analysts on Russia, State Department officials, outside science experts, and several of the alleged victims.^[80] Russia has a history of researching, developing, and using weapons that cause brain injuries, such as the Cold War-era “Moscow Signal” targeting the American embassy in Moscow.^[80][105]

In 2020 it was reported that a 2014 NSA report raised suspicions that Russia used a microwave weapon to target a person’s living quarters, causing nervous system damage; and Russia has an interest in disrupting cooperation among the U.S., China, and Cuba.^[80] The U.S. diplomats stationed in China and Cuba who reported ailments were working to increase cooperation with those countries, and some CIA analysts voiced suspicion Russia thus sought to derail their work.^[80]

A U.S. Office of Special Counsel investigation resulted in an April 2020 determination that there was “a substantial likelihood of wrongdoing” by State Department leadership.^[80] Mark Lenzi, who was a State Department diplomatic security officer stationed in Guangzhou, accused the department of a “deliberate, high-level cover-up” and of failing to protect their employees.^[80] Marc Polymeropoulos, a 26-year CIA veteran, who retired in 2019, similarly felt betrayed by CIA leadership, accusing the agency of failing to respond appropriately to a vertigo-inducing incident in Moscow in December 2017 (Polymeropoulos said the event was an attack and “the most terrifying experience of my life”, worse than experiences in Iraq and Afghanistan).^[104] Polymeropoulos fought with the CIA for years to obtain specialized medical treatment, after the agency cast doubt on the similarities between the symptoms he experienced and those experienced by the diplomats in Havana.^[104] Polymeropoulos was ultimately diagnosed at the U.S. government’s Walter Reed Medical Center with traumatic brain injury; attorney Mark Zaid, who represented almost a dozen clients who had also become ill under similar circumstances, said that Polymeropoulos was the only one of his clients who had received treatment at Walter Reed, with others obtaining treatment only from personal doctors or academic medical centers.^[104]

Near the end of the Trump administration, the Defense Department established a task force to investigate reports of attacks on DoD personnel abroad.^[12] The DoD established the task force partly due to frustration over what DoD officials considered to be a sluggish and lackluster response by the CIA and Department of State.^[12] Christopher C. Miller, who was acting defense secretary at the time, said in 2021 that “I knew CIA and Department of State were not taking this shit seriously and we wanted to shame them into it by establishing our task force.”^[12] Miller said that he began to consider the reports of mysterious symptoms to be a high priority in December 2020, after he conducted an interview with a person with major combat experience who detailed symptoms.^[12]

In December 2020, the CIA established a task force to investigate.^[12][104] The agency set up the task force after continued reports of debilitating attacks against CIA officers in various places around the world.^[104] The CIA expanded its investigation under Director William J. Burns, who took office in 2021;^[12] Burns appointed a senior CIA officer who had previously led the manhunt for Osama bin Laden to lead the agency’s investigation.^[13]

In 2020, a book by Bartholomew and Baloh, Havana Syndrome: Mass Psychogenic Illness and the Real Story Behind the Embassy Mystery and Hysteria, was published; it argued in support of the psychogenic illness hypothesis.^[106]

NASEM report

In December 2020, a study by an expert committee of the U.S. National Academies of Sciences, Engineering, and Medicine (NASEM) commissioned by the State Department released its report, concluding, “Overall, directed pulsed RF energy … appears to be the most plausible mechanism in explaining these cases among those that the committee considered”,^[107] but that “each possible cause remains speculative” and that “the report should not be viewed as conclusive”.^{[84][108][109][110]} Chaired by David Relman, the committee included Linda Birnbaum, Ronald Brookmeyer, Caroline Buckee, Joseph Fins, David A. Whelan, and others.^[110] The panel said that lack of information and direct evidence (such as medical testing data about affected persons) limited what it could conclude about the phenomenon.^{[110][111][112]} In a 2021 interview with NPR’s Sarah McCammon, Relman said that the committee identified “microwave radiation that occurs in a pulsed or intermittent form” as “the most plausible” mechanism for the injuries, but that it could not confidently identify any cause given the lack of “direct evidence that this could explain the entire story for sure or even parts of it”.^[112] Relman said that the committee lacked information to assess “what the various sources of such pulsed microwave energy might be” but that the facts left the committee “with this very sort of disconcerting notion that it had been produced deliberately by other actors whose purposes we really weren’t in a position to fathom”.^[112] Relman said that “the bottom line is that this is still a perplexing story that still needs further investigation.”^[112]

The 2020 NASEM study found that it was unlikely that “acute high-level exposure to OPs and/or pyrethroids contributed” to the illnesses, due to a lack of evidence of exposures to those pesticides or clinical histories consistent with such exposure,^[110]: 23 but the study committee “could not rule out the possibility, although slight, that exposure to insecticides, particularly OPs, increased susceptibility to the triggering factor(s) that caused the Embassy personnel cases”.^[110]: 23 NASEM also found it “highly unlikely” that an infectious disease (such as Zika virus, which was an epidemic in Cuba in 2016–17) caused the illnesses.^{[110]: 23–24}

The 2020 NASEM analysis appeared to show that psychological issues were not the likely cause of the injuries,^[113] but the different ways in which people were affected left open the possible influence of psychological and social factors.^[114] The report reads, “the likelihood of mass psychogenic illness as an explanation for patients’ symptoms had to be established from sufficient evidence” and “could not be inferred merely by the absence of other causal mechanisms or the lack of definitive structural injuries”.^[110]: 26 In its assessment of potential social and psychological causes, the committee notes the possibility of stress-based psychological responses, and that these were more likely to be triggered by potential threats attributed to human sources than other stressors. It concludes that these could not have caused the acute “audio-vestibular” symptoms some patients experienced, such as sudden unexplained sounds.^[110]: 25 The scope of the provided data limited the committee’s ability to investigate psychological and social factors.^{[110]: 26–27}

2021

This section may be too long to read and navigate comfortably. Consider splitting content into sub-articles, condensing it, or adding subheadings. Please discuss this issue on the article’s talk page. (March 2024)

2018 CDC report

In January 2021, both BuzzFeed News and George Washington University‘s National Security Archive obtained the 2018 CDC report, pursuant to Freedom of Information Act requests. (Some material in the released report was redacted for medical privacy reasons.)^[99][101] The CDC developed a “case definition” of Havana syndrome, consisting of a biphasic (two-stage) syndrome.^[100][101] The first phase of symptoms (sometimes closely after an auditory or sensory event) consisted of one or more of the following symptoms: head pressure, disorientation, nausea or headache, vestibular disturbance, or auditory or visual syndromes.^[100] The second phase of symptoms, occurring sometime later, consisted of cognitive deficits, vestibular disturbances, or both.^[100][101] The report concluded, “Of the 95 persons whose medical records CDC evaluated, 15 had illnesses that met the criteria for a presumptive case definition. CDC classified 31 others as possible cases and the remaining 49 as not likely to be a case.”^[100] Two years later, six of the subjects in the CDC investigation were still being rehabilitated for their injuries, and four were still unable to return to work.^[99] The CDC decided not to conduct a retrospective case–control study because of the length of time between the event and the onset of symptoms, which could lead to recall and selection biases that “could generate misleading or obscured findings”.^[99] The CDC concluded, “The evaluations conducted thus far have not identified a mechanism of injury, process of exposure, effective treatment, or mitigating factor for the unexplained cluster of symptoms experienced by those stationed in Havana.”^[100]

U.S. State Department

In February, the U.S. State Department said that its ongoing investigation was “a high priority” for the department.^[104] Also in February, sources familiar with the various ongoing investigations told CNN that a primary obstacle to progress by the U.S. government in investigating the syndrome was a lack of coordination among the CIA, FBI, Centers for Disease Control and Prevention, and State Department, which conducted separate and “largely siloed” investigations.^[104] The limited coordination among the agencies was due in part to “the highly classified nature of some details and the privacy restrictions of health records, and that has hampered progress”.^[104]

In March 2021, the State Department appointed ambassador Pamela L. Spratlen, a career foreign service officer, to oversee the department task force charged with responding to the incidents.^[12][115] Six months later, Spratlen left her position as coordinator of the task force because she “reached the threshold of hours of labor” that she could perform as a retiree. Her resignation had been demanded by people angered by her handling of a conference call with affected employees. During the call with employees (in which Secretary of State Antony Blinken also took part), Spratlen did not take a position on whether the syndrome was psychogenic, a response that affected diplomats called “invalidating”.^[11][116]

New Yorker reporting

Also in May, The New Yorker reported that the U.S. government’s “working hypothesis” was that GRU agents “have been aiming microwave-radiation devices at U.S. officials to collect intelligence from their computers and cell phones, and that these devices can cause serious harm to the people they target”.^[15] The U.S. government has not publicly accused Russia; U.S. intelligence officials privately call the events “attacks” but publicly call them “anomalous health incidents”.^[15] According to two officials interviewed by Politico, “While investigators have not determined definitively that these incidents are caused by a specific weapon, some believe any such device would be primarily transported by vehicle”, and “Some could be small enough to fit into a large backpack, and an individual can be targeted from 500 to 1,000 yards away.”^[14] James Lin of the University of Illinois, an expert on the biological effects of microwave energy, agreed that a Havana syndrome attack could be caused by a small apparatus that could fit in a van or SUV.^[105]

A May 2021 report in The New Yorker cited a number of incidents recounted by Mark Vandroff, who served as the senior director for defense policy at the National Security Council: “One of the most dramatic episodes involved a U.S. military officer stationed in a country with a large Russian presence. As the officer pulled his car into a busy intersection, he suddenly felt as though his head were going to explode. His two-year-old son, in a car seat in the back, started screaming. As the officer sped out of the intersection, the pressure in his head ceased, and his son went quiet. A remarkably similar incident was reported by a CIA officer who was stationed in the same city, and who had no connection to the military officer.”^[15]

Developments

Citing unnamed intelligence and government officials, The New York Times reported in July 2021 that the National Security Council, Central Intelligence Agency, and Director of National Intelligence established two outside panels, one to investigate potential causes and the other to develop defensive countermeasures for personnel protection; cleared external scientists would be permitted to view relevant classified intelligence in their investigations.^[117]

In September 2021, it was reported that within the U.S. government, analysts had debated whether the alleged attacks reflected a deliberate attempt to cause injury, or whether the reported symptoms were “a consequence of a high-tech attempt to steal classified information from phones and computers of U.S. officials”.^[13] Also in September, CIA Deputy Director David S. Cohen said that the investigation had “gotten closer” to making a determination, “but not close enough to make the analytic judgment that people are waiting for”.^[13] Also in September, it was reported that multiple anecdotes from various Western diplomats stationed overseas, including in Russia, describe mysterious ailments during past decades that might be due to microwave devices.^[53][86] Also in September, a panel of 16 scientists affiliated with the Cuban Academy of Sciences and convened by the Cuban government addressed the microwave hypothesis, writing, “No known form of energy can selectively cause brain damage (with laser-like spatial accuracy) under the conditions described for the alleged incidents in Havana.”^[45]

In October 2021, it was reported that an unclassified NSA report from 2014 indicated a hostile country in the 1990s possessed a “high powered microwave system weapon that may have the ability to weaken, intimidate or kill an enemy over time and without leaving evidence”.^[86] Also in October, Cheryl Rofer, a former chemist at the Los Alamos National Laboratory, said that there were no microwave experts on the NAS committee and that “No evidence has been offered that such a weapon has been developed by any nation.” Rofer also cited a 1978 study that found no adverse health effects from the Moscow Signal.^[118]

In November 2021, Secretary of State Blinken appointed two senior U.S. diplomats to oversee the department’s internal Health Incident Response Task Force: career foreign service officer Ambassador Jonathan M. Moore as overall coordinator^[119] and retired Ambassador Margaret Uyehara.^[120][121]

The Senate Intelligence Committee leadership (chair Mark Warner and vice chair Marco Rubio) said in 2021 that it was working with Burns and the CIA on connection with the investigation, saying, “We have already held fact finding hearings on these debilitating attacks, many of which result in medically confirmed cases of Traumatic Brain Injury, and will do more.”^[122]

In September 2021, the BBC wrote the syndrome has “a real impact on the country’s ability to operate overseas”, reporting that one official called the deciphering of the cause “the most difficult intelligence challenge they have ever faced”.^[53]

After the reports of the incident at The Ellipse nearby the White House in Washington, Defense Department investigators briefed members of Congress, even though it occurred within the U.S.; this was because the DoD investigation was more advanced than the FBI or the intelligence community investigations.^[12]

FBI Behavioral Analysis Unit

After the initial reports of the incidents in Havana, the FBI’s Behavioral Analysis Unit visited the city and came to the assessment that the individuals were experiencing a mass psychogenic illness.^[123] The Behavioral Analysis Unit profilers did not speak to any of the affected people directly, instead relying on transcripts of previous interviews that the FBI had conducted with patients.^[123] The unit reviewed the patient histories compiled by the patients’ neuropsychologists and other physicians, who had already ruled out mass psychogenic illness, noting that “many of the victims didn’t know about the other people who were sick, and their bodies couldn’t have feigned some of the symptoms they were exhibiting.”^[123]

2022

In January 2022, having performed a comprehensive study of 1,000 cases, the Central Intelligence Agency issued an interim assessment concluding that the syndrome is not the result of “a sustained global campaign by a hostile power” and that 976 of the 1000 reviewed cases could be explained by natural causes such as environmental causes, undiagnosed medical conditions, or stress, although it could not rule out foreign involvement in 24 cases, many of those from Havana.^[17][124]

On February 1, 2022, a declassified US intelligence report (IC Experts Panel on Anomalous Health Incidents) called pulsed electromagnetic energy and ultrasound plausible causes and said that concealable devices exist that could produce the observed symptoms.^[125]

In late 2022 the US Defense Health Agency issued Form 244, Anomalous Health Incident (AHI) Acute Assessment, described as “a multi-domain assessment that should be used to evaluate patients for potential AHI”.^[126]

2023

2023 U.S. intelligence report

On March 1, 2023, the House Intelligence Committee released a report, titled “Intelligence Community Assessment”, which was jointly prepared by seven U.S. intelligence agencies. The report concluded “that there is no credible evidence that a foreign adversary has a weapon or collection device that is causing AHIs”. The agencies preparing the report reviewed thousands of possible cases of Havana syndrome. The reported stated that there continues to be scientific debate about whether a weapon could produce such health effects.^[127]

Five of the seven agencies involved in generating the report concluded “the available intelligence consistently points against the involvement of US adversaries in causing the reported incidents” and that a foreign adversary’s involvement was “very unlikely”. One of the other agencies concluded that foreign involvement was “unlikely”, and the seventh agency declined to make a finding.^{[127][18][19]}

Two of the seven agencies had “high confidence in this judgment while three agencies have moderate confidence”. Two other agencies judged “that deliberate causal mechanisms are unlikely to have caused AHIs” but those agencies had “low confidence because they judge(d) that radiofrequency (RF) energy is a plausible cause for AHIs, based in part on the findings of the IC Expert Panel and the results of research by some US laboratories.”^[127]

CNN reported that in its 2023 Assessment, government officials said: “There is no one explanation for these incidents. Instead, there are many different possible causes including environmental as well as social factors and preexisting medical conditions.” The officials also told CNN that “The investigative efforts were ‘extremely aggressive’ and involved ‘a high degree of risk‘” and “Intelligence officers vigorously studied what happened in the hours, days and weeks surrounding the incidents… In some instances they found malfunctioning HVAC systems, which can cause discomfort to humans, and in other cases there were computer mice that created surprising disruptions… We weren’t finding what we expected to find… There is no one explanation for any of this.”^[128]

Of the report, CIA Director Bill Burns said, “The intelligence community assessment released today by ODNI reflects more than two years of rigorous, painstaking collection, investigative work, and analysis by IC agencies including CIA… We applied the agency’s very best operational, analytic, and technical tradecraft to what is one of the largest and most intensive investigations in the agency’s history.”^{[citation needed]}

Politico summarized the results by saying, “The finding undercuts a years-long narrative, propped up by more than a thousand reports from government employees, that a foreign adversary used pulsed electro-magnetic energy waves to sicken Americans.”^[129]

Reactions

Following release of the March 2023 report, Trump’s national security adviser John Bolton revealed that when the Cuban attack reports began, he “pretty quickly” came to believe that this was not in Cuba’s interest, and in any case thought it was beyond that nation’s capabilities. He assumed Russia was involved, but said that he chose not to brief the president on that belief as he did not think Trump would support that theory due to his prior associations with Vladimir Putin.^[130]

Upon release of the report, Cuba’s Vice Foreign Minister Carlos Fernandez de Cossio told Reuters, “The unfortunate thing is the U.S. government leveraged [Havana Syndrome] to derail bilateral relations… and discredit Cuba.” Reuters also reported that “Cuba has for years labeled as ‘science fiction’ the idea that ‘Havana Syndrome’ resulted from an attack by a foreign agent, and its top scientists in 2021 found no evidence of such allegations.”^[46]

Despite the report’s conclusion, U.S. Senator Marco Rubio, the vice chairman of the Senate Intelligence Committee, issued a statement on March 2 rejecting the finding, saying, “Something happened here, and just because you don’t have all the answers doesn’t mean that it didn’t happen.” Rubio said his panel would continue an independent review of the claims.^[131]

Attorney Mark Zaid, founder of the James Madison Project, who represents some Havana syndrome patients, disputed the report’s conclusions. In a March 2023 Salon interview, he maintained that “these events were perpetrated either by foreign actors, or it is an experiment gone horribly wrong”. He suggested that the truth was “buried in the information they’ve classified”.^[132]

2024

NIC report

On March 1 2024, a report by the National Intelligence Council concluded that it is “very unlikely” that a foreign adversary was responsible for Havana syndrome.^[20] The comprehensive assessment aligned with previous CIA reports and emphasized a lack of credible evidence linking these health incidents to any hostile foreign actions. Despite the ongoing debate and varying opinions within the intelligence community, the report held that official stance is that the symptoms are likely caused by a combination of environmental factors, pre-existing conditions, or conventional illnesses, rather than any form of directed energy attack by a foreign nation.^[133][134]

Insider investigative report

On March 31 2024, The Insider, in collaboration with 60 Minutes and Der Spiegel, published an investigative report claiming that the syndrome was potentially caused by actions of Russian military intelligence.”^{[135][136] [137]} The report states that members of the GRU Unit 29155, known for undertaking foreign operations,^[136] received awards and promotions for work related to the development and deployment of “non-lethal acoustic weapons“, and that telephone and travel data pinpointing the locations of these agents correlated with the timings and locations of Havana syndrome incidents worldwide.^{[138][139][140]}

The Kremlin Press Secretary dismissed the report as “nothing more than baseless, unfounded accusations by the media.”^[135] In response to the report, the White House Press Secretary said that a “foreign adversary is very unlikely.”^[141]

Following the report, in a letter addressed to the President several U.S. Senators called for further investigations into the causes of the anomalous health incidents.^[142] Anomalous health incidents’ victims lawyer Mark Zaid and one of the report’s authors, Christo Grozev, later testified on the subject of the report at the United States Congress.^[143][144]

Legislative responses

In response to Havana syndrome, senator Susan Collins introduced a bill (S. 1828), cosponsored by a bipartisan group of nine other senators, that would close a loophole in the Federal Employees’ Compensation Act that would normally not cover damage to organs such as the brain and heart.

The National Defense Authorization Act for Fiscal Year 2022, passed by Congress in December 2021, included a section directing the president to designate a senior official as “anomalous health incidents interagency coordinator” to oversee efforts across the federal government and to coordinate with the White House Office of Science and Technology Policy, required relevant federal agencies to designate a specific high-level “anomalous health incident agency coordination lead” and directed agencies to develop guidance to employees considered to be at risk of exposure.^[145]

Financial compensation

In 2021, Congress passed the Helping American Victims Afflicted by Neurological Attacks (HAVANA) Act, which authorized the CIA director and the secretary of state to provide financial support for personnel with brain injuries. The bill passed the House and Senate unanimously and was signed into law by president Joe Biden on October 8, 2021, becoming Public Law No. 117-46.^{[146][147][148]}

The HAVANA Act gives an untaxed lump-sum payment of up to one year’s full salary ($187,300 for higher-ranking employees) to government employees that provide evidence of neurological injury. The payment is in addition to workers’ compensation or disability payments.^{[149][150][151]}

Animal experimentation

In March 2023, Politico reported that the U.S. Army funded a $750,000 grant to Wayne State University for a study to expose 48 ferrets to RF waves, comparing the effects to those from a control group of ferrets; the Department of Defense described the project as an attempt to “develop and test a novel laboratory animal model to mimic mild concussive head injury” similar to those reported by the embassy personnel in Havana and China.^[152] Politico also reported that the U.S. Department of Defense had recently tested RF waves on primates.^[152] The animal rights group PETA demanded that the Pentagon end live-animal testing in relation to Havana syndrome.^{[152][153][154]}

See also

• Brown note (hypothetical sonic weapon)
• Cuba–United States relations
• Cuban fever, a late-19th to early-20th century name for a form of tropic fever
• Electronic harassment
• Health scare
• Microwave auditory effect
• Moscow Signal
• Post-concussion syndrome
• Russia–United States relations

References

External links

Wikimedia Commons has media related to Havana syndrome.

• “Havana Syndrome” at Reveal (8 April 2023)
• Vice News: Havana Syndrome podcast on Apple Podcasts and Spotify