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Though rare, there have been a total of 475 reported cases of myocarditis or pericarditis in people age 30 and younger, according to the CDC. Most patients who were hospitalized, or 81% of them, had full recovery from their symptoms, the agency said. As of May 31, 15 people remain hospitalized, with three in intensive care.

The majority of cases appear to occur in men and the median time to the onset of symptoms is two to three days, according to the CDC.

Some of the reported cases may be something else other than myocarditis or pericarditis upon further investigation, Shimabukuro said.

The CDC’s vaccine safety group said last month it was looking into heart inflammation conditions in a “relatively few” people who received Covid vaccinations.

The cases were predominantly in adolescents and young adults and usually occurred within four days after getting the shot, the CDC said at the time. The condition was seen more often in men and most cases appear to be mild, the agency said, though officials are following up with the patients.

The CDC is coordinating its investigation with the FDA, which last month authorized the Pfizer-BioNTech vaccine for adolescents ages 12 to 15.

“We still don’t know whether this is truly related to the vaccine,” Dr. Peter Marks, director of the FDA’s Center for Biologics Evaluation and Research, said during a virtual Q&A event on May 27. He added that the “handful” of cases reported have been “very mild, lasting a day or two” and usually happened after a second dose.

Health experts say finding rare side effects once a vaccine or drug is administered to the general population is common and if myocarditis turns out to be related to the Covid vaccine, the risk is negligible when compared with the risks of being infected with Covid-19.