Three things to know about the long-term side effects of ...
Jul 06, 2021 · “The causes are still being worked out; but when this happens, it occurs from six days to two weeks after vaccination,” he said. “More recently, an even more rare side effect — myocarditis, or inflammation of the heart muscle — has been reported in people receiving Pfizer and Moderna COVID-19 vaccines. That is about one in a million, or possibly higher rates in some populations; but again, all of these occur no more than a month after the vaccination.”
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