2020
Sept. 22, 2020: U.S. Centers for Disease Control and Prevention (CDC) identifies myocarditis as an adverse event of special interest, or a potential side effect.
Oct. 30, 2020: U.S. Food and Drug Administration (FDA) identifies myocarditis as an adverse event of special interest.
December 2020: One case of pericarditis reported to the U.S. Vaccine Adverse Event Reporting System (VAERS), which is co-managed by the CDC and FDA.
Dec. 11, 2020: FDA authorizes the Pfizer-BioNTech vaccine for Americans 16 and older.
Dec. 13, 2020: CDC launches V-safe, a new vaccine safety monitoring system, without including myocarditis as an option in the adverse events list.
Dec. 18, 2020: FDA authorizes the U.S. government-backed Moderna vaccine for Americans 18 and older.
2021
2021: Myocarditis cases spike in the U.S. military.
January 2021: 28 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS.
January 2021: First U.S. military member experiences postvaccination myocarditis, according to a study published months later.
January 2021: First cases of postvaccination myocarditis recorded in Israel.
January 2021: VAERS report processing is delayed due to unexpected spike in reports.
February 2021: 64 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including two deaths.
Feb. 1, 2021: Israeli teenager is hospitalized with myocarditis after Pfizer vaccination, doctors say.
Feb. 18, 2021: Safety signal for myocarditis triggered in VAERS using CDC-endorsed method called Proportional Reporting Ratio.
Feb. 19, 2021: Safety signal for myocarditis triggered in VAERS using another method called Fisher’s Exact Test.
Feb. 24–25, 2021: CDC meets with its advisers but does not discuss COVID-19 vaccines.
Feb. 27, 2021: FDA authorizes Johnson & Johnson's COVID-19 vaccine.
Feb. 28, 2021: Israeli officials privately alert CDC to "a large number of reports of myocarditis, particularly in young people, following the administration of the Pfizer vaccine."
Feb. 28, 2021: 57 cases of myocarditis or pericarditis within seven days of vaccination in Pfizer's database in document given to the FDA in April 2021 and not revealed to the public until November 2021.
March 2021: 54 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS.
March 1, 2021: CDC officials disclose (pdf) that two postvaccination cases were identified in the Vaccine Safety Datalink (VSD), another CDC-run system.
March 2, 2021: CDC recommends Johnson & Johnson's COVID-19 vaccine for adults.
March 3, 2021: Israeli authorities meet with hospital officials to discuss postvaccination heart problems.
March 4, 2021: Israeli officials confirm they're investigating postvaccination pericarditis.
March 5, 2021: FDA holds meeting with its advisers. Myocarditis is not discussed.
March 6, 2021: Rutgers University becomes first major US school to announce COVID-19 vaccine mandate.
March 8, 2021: Australian health officials contact CDC about U.S. myocarditis cases.
March 9, 2021: U.S. internal memorandum says Israel received around 40 reports of postvaccination myocarditis. U.S. officials say some postvaccination cases were reported in the United States and acknowledge issues with passive surveillance such as underreporting. "Thus, FDA has not made a final determination regarding the causality between myopericarditis and the mRNA COVID-19 vaccines," the memo stated.
March 20, 2021: First postvaccination myocarditis case report is published in the literature.
March 20, 2021: Pfizer contract with South Africa (pdf) says that "there may be adverse effects of the vaccine that are not currently known."
March 31, 2021: Second postvaccination myocarditis case report published.
March 31, 2021: First death from postvaccination myocarditis reported in Israel. The deceased was a 22-year-old previously healthy woman.
April 2021: 158 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS.
April 2021: CDC holds multiple public meetings with no discussion of myocarditis.
April 1, 2021: Israel has received 84 reports of postvaccination myocarditis or pericarditis, news outlet reports.
April 2, 2021: U.S. military officials, CDC meet on postvaccination myocarditis cases.
April 5, 2021: Israeli officials brief the CDC on postvaccination myocarditis cases.
April 5, 2021: Canada reports first case of postvaccination pericarditis.
April 7, 2021: U.S. government call covers myocarditis cases recorded in military members after vaccination.
April 10, 2021: CDC-funded Clinical Immunization Safety Assessment program reviewed postvaccination myocarditis cases, email shows.
April 12, 2021: U.S. military officials brief CDC on postvaccination myocarditis cases.
April 12, 2021: Canada reports first case of postvaccination myocarditis.
April 13, 2021: U.S. military has submitted manuscripts on myocarditis cases to two journals, CDC official says.
April 13, 2021: CDC, FDA advise pause in administration of Johnson & Johnson's vaccine due to six cases of blood clotting.
April 15, 2021: Two otherwise healthy adults hospitalized with chest pain and diagnosed with myocarditis after Moderna vaccination, CDC adviser tells agency.
April 17, 2021: CDC official tells adviser there have been reports of myocarditis after COVID-19 vaccination "but we aren't observing any clear indication of a safety signal."
April 20, 2021: Three cases of myocarditis after second Pfizer dose in Idaho, official tells CDC.
April 23, 2021: United States lifts recommended pause on Johnson & Johnson's vaccine.
April 23, 2021: Israeli Ministry of Health report on postvaccination myocarditis identifies two deaths, Israeli media report. The second deceased was a previously healthy 35-year-old man. Among men aged 18 to 30, there is a one in 20,000 probability of developing myocarditis, the report found. "It seems that these events can be a signal of a possible connection to the vaccine," the committee said. The findings were sent to the FDA.
April 26, 2021: U.S. military officials are tracking 14 cases of myocarditis following messenger RNA vaccination, Military.com reports.
April 26, 2021: CDC Director Dr. Rochelle Walensky says CDC "aware of" cases in the military. She says "we have not seen any reports of those" and that "we have not seen a signal" in CDC databases.
April 27, 2021: CDC officials privately acknowledge that processing of VAERS reports is "taking longer than usual."
April 27, 2021: CDC officials say 24 cases of myocarditis were identified in VSD.
April 27, 2021: U.S. military official warns that pausing administration of the Pfizer and Moderna vaccines "will have an adverse impact on US/CA vaccination rates."
April 28, 2021: France detects safety signal for postvaccination myocarditis.
April 28, 2021: CDC director receives notes from discussion with military on myocarditis cases.
April 29, 2021: First cases of pericarditis after COVID-19 vaccination reported in the literature.
April 30, 2021: FDA receives Pfizer report noting myocarditis cases in Pfizer's database.
May 2021: 487 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including four deaths.
May 2021: CDC forms a team to review medical records for reported cases of postvaccination myocarditis.
May 5, 2021: CDC meets with advisers but doesn't discuss COVID-19 vaccines.
May 7, 2021: European Medicines Agency announces it has asked Pfizer for information on myocarditis after COVID-19 vaccination.
May 10, 2021: FDA authorizes Pfizer's COVID-19 vaccine for children aged 12 to 15. It does not mention myocarditis.
May 12, 2021: Myocarditis is not discussed during meeting on Pfizer's COVID-19 vaccine. Dr. Tom Shimabukuro, a CDC official, gives a presentation on blood clotting after Johnson & Johnson vaccination.
May 12, 2021: Dr. Walensky recommends Pfizer's vaccine for virtually all children aged 12 to 15, based on advice from advisers.
May 13, 2021: CDC officials told to direct questions on potential myocarditis cases to two top vaccine safety officials, Drs. John Su and Shimabukuro.
May 13, 2021: Same officials discuss analyzing VAERS data for myocarditis using the Proportional Reporting Ratio in heavily redacted emails. The agency says the analysis didn't actually start until 2022.
May 13, 2021: CDC adviser says "multiple people texting and email[ing] me with concerns" about myocarditis.
May 13, 2021: Children's National in Washington registers two suspected cases.
May 14, 2021: Dr. Shimabukuro seeks "experts in myocarditis."
May 16, 2021: CDC official says in email, "we are hearing quite a lot about this now, and I don't have a clear understanding of what is and has been being done."
May 17, 2021: CDC workgroup says there are "relatively few" reports of myocarditis after vaccination and that rates "have not differed from expected baseline rates."
May 17, 2021: Dr. Shimabukuro speaks with American Academy of Pediatrics officials to "centralize our coordination" with outside groups.
May 17, 2021: Dr. Su says health care providers "aren't reporting these cases to VAERS."
May 17, 2021: Dr. Su says the "myocarditis thing" is "exploding."
May 18, 2021: States across the U.S. publicly report cases of myocarditis following COVID-19 vaccination.
May 18, 2021: First case report of an American person with postvaccination myocarditis published.
May 19, 2021: CDC tells state officials it has been "closely monitoring" myocarditis and pericarditis after COVID-19 vaccination and that cases "can be serious."
May 20, 2021: Three more cases of postvaccination myocarditis at Connecticut Children's Medical Center, official tells CDC.
May 20, 2021: CDC officials hold meeting with doctors from pediatric hospitals on myocarditis cases. Slides from the meeting were provided to The Epoch Times fully redacted.
May 23, 2021: The American Heart Association says the benefits of COVID-19 vaccination for everyone eligible "enormously outweigh the rare, possible risk of heart-related complications, including inflammation of the heart muscle."
May 24, 2021: CDC workgroup acknowledges for the first time that the number of reports of postvaccination myocarditis to VAERS was higher than expected in those 16 to 24.
May 24, 2021: French Society of Cardiology calls for vaccinating heart failure patients without acknowledging possible vaccine-myocarditis connection.
May 24, 2021: Massachusetts official asks CDC for "messaging" on postvaccination myocarditis.
May 25, 2021: Dr. Paul Offit, an FDA adviser, says about myocarditis and COVID-19 vaccines, "there’s every reason to think this isn’t a problem."
May 26, 2021: The New Zealand Medicines and Medical Devices Safety Authority says there's a safety signal for myocarditis and COVID-19 vaccines.
May 28, 2021: CDC says to keep vaccinating everyone eligible, or virtually all Americans 12 and older.
May 28, 2021: Case series of young, previously healthy males hospitalized with postvaccination myocarditis discloses hospitalizations happened as early as Jan. 30, 2021.
May 28, 2021: CDC says it is focusing on reported cases among those 30 and under.
May 28, 2021: Nine postvaccination myocarditis cases from one state not reported to VAERS, according to CDC.
May 30, 2021: Brighton Collaboration issues case definition for myocarditis.
June 2021: 752 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including five deaths.
June 2021: Some experts start calling on U.S. authorities to pause COVID-19 vaccination of young, healthy people.
June 2, 2021: Israel says "there is some probability for a possible link between the second vaccine dose and the onset of myocarditis among young men aged 16 to 30" after researchers find incidence of one in 3,000 to one in 6,000 men aged 16 to 24.
June 4, 2021: U.S. researchers report seven cases in healthy young males following Pfizer vaccination.
June 10, 2021: 99 cases of myocarditis/pericarditis detected in FDA's Biologics Effectiveness and Safety Initiative database, and 1,260 cases reported in Medicare claims data, FDA official says (pdf).
June 10, 2021: CDC working to rapidly follow up on reports of myocarditis following vaccination among people aged 30 and under, CDC official says (pdf). Most cases are in young adults after a second dose.
June 10, 2021: "There’s a lack of alternative explanations" apart from vaccination given the consistency across postvaccination cases, Dr. Cody Meissner, an FDA adviser, says.
June 10, 2021: "I think the myocarditis is something that needs to be looked at closely because we’re likely seeing the tip of the iceberg," says Dr. Michael Kurilla of the U.S. National Institutes of Health, another FDA adviser. June 10, 2021: Pfizer spokesperson tells news outlets that "the benefit-risk profile of our vaccine remains positive."
June 11, 2021: European Medicines Agency announces investigation into reports of myocarditis after COVID-19 vaccination.
June 23, 2021: CDC’s safety committee says evidence now suggests a "likely association" of mRNA vaccination and myocarditis.
June 23, 2021: Number of myocarditis cases recorded in VSD rise to 75. Based on VAERS reports, CDC says number of events higher than expected after dose two in males aged 12 to 49 and females aged 12 to 29. Among children 12 to 17, 188 cases were reported within 21 days of vaccination through June 11. CDC advisers say data suggest vaccines cause myocarditis.
June 23, 2021: CDC estimates (pdf) Pfizer's vaccine will cause up to 69 myocarditis cases per million second doses but will prevent 215 hospitalizations and two deaths in males aged 12 to 17.
June 25, 2021: FDA adds warnings about "the suggested increased risks" of myocarditis and pericarditis to labels for the Moderna and Pfizer vaccines.
June 28, 2021: The U.S. Department of Veteran Affairs says privately it detected more myocarditis cases than expected.
June 29, 2021: Military researchers report 22 previously healthy members suffered myocarditis after receiving a messenger RNA vaccine. "The presentation pattern and clinical course suggest an association with an inflammatory response to vaccination," they say. The cases are among hundreds reported in the literature this month.
June 29, 2021: CDC officials say of reported cases that "the striking clinical similarities in the presentations of these patients, their recent vaccination with an mRNA-based COVID-19 vaccine, and the lack of any alternative etiologies for acute myocarditis suggest an association with immunization."
June 30, 2021: Canada adds myocarditis and pericarditis risk information to labels of Moderna and Pfizer vaccines.
July 2021: 364 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including seven deaths.
July 3, 2021: 13 young males with postvaccination myocarditis treated at a single hospital in Washington state between April 1, 2021, and June 21, 2021, researchers report.
July 6, 2021: CDC estimates for every million doses of vaccination, dozens of cases of myocarditis can be expected, including 56 to 69 cases among 12- to 17-year-olds. The expected benefits outweigh the risks, though, according to the agency.
July 9, 2021: European Medicines Agency recommends listing myocarditis and pericarditis as side effects for the Pfizer and Moderna vaccines after identifying 221 cases after mRNA vaccination. Five of the patients died.
July 10, 2021: South Korean researchers report a 22-year-old man was killed by vaccine-induced myocarditis, the first such death reported in the literature.
July 22, 2021: CDC says it confirmed 282 postvaccination myocarditis cases in people aged 18 to 29.
July 28, 2021: Pfizer tells FDA of "important identified risk" of myocarditis and pericarditis after vaccination and discloses 17 deaths among the cases reported.
July 30, 2021: Data mining does not show a signal for myocarditis among adolescents 12 to 17, CDC and FDA say.
July 31, 2021: Australian experts recommend people be informed about possibility of myocarditis and pericarditis following vaccination.
August 2021: 311 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including seven deaths.
Aug. 4, 2021: UK delays recommending second dose for 16- and 17-year-olds.
Aug. 10, 2021: 15 children hospitalized at Boston Children's Hospital with postvaccination myocarditis between May 1 and July 15, 2021, researchers say.
Aug. 13, 2021: Canada identifies a safety signal for postvaccination myocarditis.
Aug. 17, 2021: Death of 27-year-old man following myocarditis after COVID-19 vaccination reported by U.S. researchers. Family declined an autopsy. No non-vaccination causes identified.
Aug. 18, 2021: U.S. researchers report death of 42-year-old man with myocarditis following Moderna vaccination. No other causes identified.
Aug. 18, 2021: Dr. Walensky and other U.S. government officials call for COVID-19 vaccine boosters to be cleared due to waning effectiveness.
Aug. 19, 2021: Two deaths from myocarditis following Pfizer vaccination, Pfizer reports to the EMA.
Aug. 19, 2021: Dr. Walensky notified of UK preference for Pfizer over Moderna for adolescents.
Aug. 23, 2021: FDA approves Pfizer's vaccine for people 16 and older. Approval theoretically has a higher bar than authorization. The agency says that analyses of reported events "will not be sufficient to assess known serious risks of myocarditis and pericarditis."
Aug. 24, 2021: South Korean authorities determine a young man died from myocarditis after Pfizer vaccination.
Aug. 30, 2021: One myocarditis case and one pericarditis case occurred among vaccinated trial participants, Pfizer reveals.
Aug. 30, 2021: Of 742 reports in VAERS that met the CDC case definition of myocarditis or myopericarditis after vaccination, 701 patients required hospitalization and 18 are still hospitalized, CDC official reports (pdf). Twenty-three percent of patients whose cases were detailed in VAERS reports were not known to have recovered at the time of the report.
Aug. 30, 2021: Highest rate of reported myopericarditis cases within seven days of a shot was 71.5 cases per million second Pfizer doses among boys aged 16 or 17, according to the CDC.
Aug. 30, 2021: Myocarditis and pericarditis cases in VSD rise to 115, with some patients still experiencing symptoms, CDC official says (pdf).
Aug. 30, 2021: Benefits of Pfizer's vaccine continue to outweigh the risks, CDC officials say. They estimate every million Pfizer shots among 16- to 17-year-olds will cause 73 cases of myocarditis but prevent more hospitalizations.
Aug. 30, 2021: Woman who died in New Zealand after Pfizer vaccination perished from myocarditis, an independent safety panel said.
September 2021: 377 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including 10 deaths.
Sept. 2, 2021: 654 reports of myocarditis or pericarditis in Pfizer's safety database, company says. Seventy-seven reports of myocarditis or myocarditis and pericarditis in Moderna's safety database, company says. Some patients, including a young male, died or had not recovered.
Sept. 2, 2021: Based on the reports and other data, a causal association between myocarditis/pericarditis and the mRNA vaccines is "considered of at least a reasonable possibility," the European Medicines Agency says.
Sept. 3, 2021: 67 myocarditis/pericarditis cases recorded in VSD among people aged 12 to 39, CDC says.
Sept. 8, 2021: Healthy, young boys face a higher risk of cardiac events from vaccines than from COVID-19, U.S. researchers find.
Sept. 9, 2021: U.S. President Joe Biden and his administration announce COVID-19 vaccine mandates for tens of millions of Americans, including many young, healthy people.
Sept. 15, 2021: Hong Kong changes recommendation from two doses of Pfizer to one dose after spike in myocarditis cases.
Sept. 17, 2021: Excess myocarditis risk for vaccinated males aged 16 or 17 "approaching 200 cases per million," FDA discloses, based on data from Optum health care claims database.
Sept. 21, 2021: "A clear signal for vaccine associated myocarditis has emerged," U.S. doctors say.
Sept. 22, 2021: One case of myocarditis reported after Pfizer booster, CDC official says. Not possible to determine the risk of rare side effects like myocarditis after boosting, CDC safety committee says.
Sept. 22, 2021: V-safe does not collect information on myocarditis, CDC official admits.
Sept. 22, 2021: FDA authorizes a Pfizer booster for millions of Americans.
Sept. 23, 2021: CDC officials say they don't know how many cases of myocarditis booster shots will cause. They project up to 26 cases per million boosters in 18- to 29-year-olds, but say more COVID-19 cases and hospitalizations would be prevented.
Sept. 24, 2021: CDC recommends Pfizer's booster for certain populations.
Sept. 27, 2021: New Zealand expert tells CDC it "seems to make huge sense to me" to delay second doses for young people.
Sept. 28, 2021: Pfizer vaccine may have "played a role" in death of 15-year-old California boy who died after receiving shot, medical examiner tells CDC.
Sept. 29, 2021: CDC meets on non-COVID vaccines.
Sept. 30, 2021: CDC falsely tells California officials that reports of postvaccination myocarditis did not come until June 2021.
October 2021: 321 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including five deaths.
Oct. 4, 2021: Identification of postvaccination myocarditis cases "does not change clinical decision-making," JAMA Internal Medicine editors say.
Oct. 7, 2021: Norway, Finland, and Sweden suspend use of Moderna's vaccine for younger people due to myocarditis risks.
Oct. 8, 2021: Iceland suspends use of Moderna's vaccine due to the heart inflammation.
Oct. 11, 2021: CDC director briefed on how Nordic countries are limiting vaccination due to myocarditis.
Oct. 12, 2021: Secret U.S. government meeting considering counting post-infection immunity as one or more vaccine doses ends with no update.
Oct. 14, 2021: FDA says more myocarditis/pericarditis cases have been reported to its Biologics Effectiveness and Safety Initiative system.
Oct. 21, 2021: The U.S. Department of Veterans Affairs has identified 7 post-vaccination myocarditis cases, CDC publicly discloses, but no signal was established and all cases resolved.
Oct. 21, 2021: Highest rate of myocarditis following vaccination, based on VAERS data, is 69.1 cases per million second shots among males aged 16 or 17, Dr. Su says (pdf).
Oct. 21, 2021: About a quarter of cases in people 29 or younger reviewed in VAERS were not known to have recovered, according to available data, with 19 still hospitalized.
Oct. 21, 2021: Analyses of VSD data "indicate that both Pfizer and Moderna are associated with increased risk of myocarditis/pericarditis in 12–39-year-olds," Kaiser Permanente doctor says (pdf). Myocarditis/pericarditis cases in VSD rise to 138, with rates higher after Moderna vaccination compared to Pfizer vaccination.
Oct. 21, 2021: CDC says tens of millions of Americans should get a Pfizer or Moderna booster.
Oct. 22, 2021: Rates of reported cases among males aged 18 to 24 approximately 139 per million after Moderna second dose and 43 per million after Pfizer second dose, French researchers say.
Oct. 22, 2021: Norway says adolescents can't get second doses of Pfizer's vaccine.
Oct. 26, 2021: FDA says benefits of vaccination outweigh the risks. Projection of harm is highest for 16- and 17-year-old males, at 196 postvaccination myocarditis/pericarditis cases, and 171 myocarditis/pericarditis hospitalizations per million doses.
Oct. 26, 2021: CDC cardiologist Dr. Matthew Oster says "we don't know a whole lot" about myocarditis after COVID-19 vaccination. "We really need to see what the long-term outcomes for these kids will be," he added later.
Oct. 26, 2021: Dr. Michael Nelson, an FDA vaccine adviser, says he's concerned that some cases of postvaccination myocarditis aren't being reported.
Oct. 26, 2021: Dr. Eric Rubin, another FDA adviser, says "we’re never going to learn about how safe this vaccine is unless we start giving it."
Oct. 27, 2021: World Health Organization says the mRNA vaccines likely cause myocarditis.
Oct. 27, 2021: Prevalence of postvaccination myocarditis may be underestimated due to its reliance on symptoms for diagnosis, researchers say.
Oct. 28, 2021: Dr. Su says myocarditis reported after COVID-19 vaccination "has been neither severe nor persistent ... however, we'll need to wait to see if longer-term complications arise." He also says CDC does not know what percent of cases became chronic.
Oct. 29, 2021: FDA authorizes Pfizer's vaccine for children aged 5 to 11 despite dearth of efficacy data.
Oct. 30, 2021: Seventeen myocarditis patients seen at a single facility in Switzerland between March and July 2021, researchers report (pdf).
Oct. 31, 2021: FDA delays decision on approving Moderna's vaccine for children.
November 2021: 267 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including six deaths.
Nov. 1, 2021: Dr. Su says in email that "we're all doing our part to build confidence" in COVID-19 vaccines.
Nov. 1, 2021: English researchers estimate vaccinating children aged 12 to 17 will prevent 230 to 4,590 COVID-19 hospitalizations while causing 160 cases of myocarditis requiring hospitalization.
Nov. 1, 2021: Seven patients still had symptoms about a month after being diagnosed with myocarditis, U.S. researchers report.
Nov. 2, 2021: Nine deaths with myocarditis reported among people 29 and younger in VAERS. Most deaths had at least one potential non-vaccination cause while evaluation of two was still ongoing, CDC official says (pdf).
Nov. 2, 2021: Of postvaccination myocarditis patients who received cardiac MRIs, 72 percent had abnormal results, official says. Of patients who responded to CDC survey, 48 percent reported symptoms persisting after three months.
Nov. 2, 2021: Rates of myocarditis after Pfizer vaccination in children aged 5 to 11, if cleared, is unknown, CDC says (pdf). Rates in those 12 to 15 are as high as 108.5 per million second doses among males.
Nov. 2, 2021: CDC recommends virtually all children aged 5 to 11 receive a Pfizer series.
Nov. 3, 2021: 18-year-old previously healthy woman dies after COVID-19 vaccination with fulminate myocarditis, Washington state officials tell CDC. They attribute the myocarditis to asymptomatic COVID-19. Family declined an autopsy at one facility and King County Medical Examiner's Office says it did not perform an autopsy due to "social and complex" reasons.
Nov. 8, 2021: France halts Moderna's vaccine for people under 30.
Nov. 16, 2021: UK recommends second dose for 16- and 17-year-olds.
Nov. 18, 2021: Reported cases of myocarditis as high as 117 per million after doses of Moderna, and 47 per million doses of Pfizer, among males aged 18 to 29, German researchers say.
Nov. 19, 2021: Lower rates of myocarditis reported to VAERS after booster doses, CDC official says (pdf). Fifty-four reports were lodged, with some people not known to have recovered.
Nov. 19, 2021: CDC enables all adults to receive a booster of the Pfizer or Moderna vaccines.
Nov. 23, 2021: Between Dec. 27, 2020 and Sept. 3, 2021, 113 patients with suspected myocarditis after COVID-19 vaccination presented to a single practice, German researchers report.
Nov. 26, 2021: Six people were reported to have died with myocarditis or pericarditis after Pfizer vaccination, the Netherlands Pharmacovigilance Centre Lareb reports. Other causes were found for two of the deaths.
Nov. 28, 2021: Hong Kong researchers find rate of 212 myocarditis cases among 12- to 17-year-old males per million Pfizer second doses.
Nov. 28, 2021: Three verified cases of post-booster myocarditis, CDC discloses in private emails.
Nov. 29, 2021: UK recommends second dose for 12 to 15-year-olds.
December 2021: 304 cases of myocarditis, pericarditis, or myopericarditis reported to VAERS, including five deaths.
Dec. 1, 2021: 22-year-old woman spent 74 days in hospital with myocarditis after AstraZeneca vaccination, South Korean researchers report.
Dec. 2, 2021: European Medicines Agency says safety signal confirmed for postvaccination myocarditis.
Dec. 2, 2021: Israeli researchers estimate 106.9 myocarditis cases per million vaccinated males aged 16 to 29.
Dec. 9, 2021: FDA authorizes booster doses for 16- and 17-year-olds.
Dec. 9, 2021: CDC says 16- and 17-year-olds should get a booster shot. It does not mention myocarditis.
Dec. 14, 2021: 114 vaccinated people had myocarditis listed as a cause of death on their death certificate, English researchers report.
Dec. 16, 2021: Eight cases of myocarditis among children aged 5 to 11 confirmed, including one in a 6-year-old male, CDC official says.
Dec. 18, 2021: 26-year-old New Zealand man's death ruled as being caused by vaccine-induced myocarditis following an autopsy.
Dec. 25, 2021: Males under 40 face an excess risk of 101 cases per million second doses, UK researchers find.
Dec. 27, 2021: Incidence of myocarditis among males 12 to 39 is 195.4 per million second doses among males aged 12 to 39, U.S. researchers estimate. They identify cases missed by the CDC.Dec. 28, 2021: Risk of myocarditis much higher from Moderna's vaccine compared with Pfizer's shot, Canadian officials report.
Dec. 30, 2021: 21 patients with myocarditis after COVID-19 vaccination admitted to a single center between Dec. 15, 2020, and June 15, 2021, U.S. researchers report.
Dec. 30, 2021: 14-year-old hospitalized with shock after Pfizer vaccination, Moroccan doctors say.
2022
Jan. 3, 2022: Non-vaccine causes of death ruled out in death of 57-year-old New Zealand woman who experienced myocarditis after COVID-19 vaccination, researchers report.
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