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For each vaccine, the fact sheets for healthcare providers have been revised to include a warning that reports of adverse events suggest increased risks of myocarditis and pericarditis, particularly after the second dose and with onset of symptoms within a few days after vaccination, the FDA said.
As of June 11, more than 1,200 cases of myocarditis or pericarditis have been reported to the U.S. Vaccine Adverse Event Reporting System (VAERS), out of about 300 million mRNA vaccine doses administered.
The cases appear to be notably higher in males and in the week after the second vaccine dose. The CDC identified 309 hospitalizations from heart inflammation in persons under the age of 30, of which 295 have been discharged.
Health regulators in several countries have been investigating cases of myocarditis and pericarditis, more frequently found in young men, after a shot of Pfizer or Moderna, vaccines that are based on the mRNA technology.
The latest update from FDA follows an extensive review of information and the discussion by CDC’s Advisory Committee on Immunization Practices meeting on Wednesday.
Pfizer and Moderna did not immediately respond to requests for comment after business hours.
