In this Saturday, May 15, 2021, file photo, empty vials of the Pfizer COVID-19 vaccine lie in a box during a vaccine campaign in Ebersberg near Munich, Germany. Health authorities are trying to determine whether heart inflammation that can occur along with many types of infections could also be a rare side effect in teens and young adults after the second dose of COVID-19 vaccine. (AP Photo/Matthias Schrader, File)
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