There have been “relatively few” cases of young people developing heart symptoms following their inoculations, but the CDC is requesting that “information about this potential adverse event” be provided to clinicians to “enhance early recognition and appropriate management of persons who develop myocarditis symptoms.”
Myocarditis is an inflammation in the heart muscle. The few dozen cases so far have involved teenagers and young adults, mostly males, who have received either the Moderna or Pfizer-BioNTech vaccines.
The CDC’s vaccine safety group has not determined whether the condition is directly related to the vaccinations, and said the cases have been “mild” thus far. Patients have reported their symptoms within four days of receiving a vaccine dose. Follow-up cases are currently ongoing.
The agency has not specified the exact ages of the patients reporting symptoms, but the Pfizer-BioNTech has been approved for people 16 years or older since December, and to people between the ages of 12 and 15 since last month.
In April, Israel’s Health Ministry also announced it was looking into a handful of cases of heart inflammation, possibly linked to the Pfizer vaccine. The cases reported had been from people aged 30 or below.
“Adverse events are regularly and thoroughly reviewed and we have not observed a higher rate of myocarditis than what would be expected in the general population. A causal link to the vaccine has not been established,” Pfizer said at the time in a statement.