“We strongly encourage everyone age 12 and older who are eligible to receive the vaccine under Emergency Use Authorization to get vaccinated,” it said.
Doctors and hospitals have been warned by the CDC to watch for symptoms of myocarditis or pericarditis, and the FDA warning will further raise awareness.
Concerns about the more highly transmissible Delta coronavirus variant taking hold in the United States, and its impact on younger people, have added to the urgency to increase vaccinations even as the inoculation effort here has slowed considerably.
The cases of heart inflammation appear to be notably higher in the week after the second vaccine dose and in males. The CDC identified 309 hospitalizations from the heart inflammation in persons under the age of 30, of which 295 have been discharged.
Dr. Tom Shimabukuro, deputy director of the CDC’s Immunization Safety Office, said in a presentation that data from one of the agency’s safety monitoring systems — Vaccine Safety Datalink (VSD) — suggests a rate of 12.6 cases per million in the three weeks after the second shot in 12- to 39-year-olds.