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FILE – In this Wednesday, May 19, 2021 file photo, a licensed practical nurse draws a Moderna COVID-19 vaccine into a syringe at a mass vaccination clinic at Gillette Stadium in Foxborough, Mass. On Wednesday, June 23, 2021, federal officials said they plan to strengthen cautions about a rare side effect of some COVID-19 vaccines — chest pain and heart inflammation, mostly among teenagers and young adults. But in an unusual joint statement, top U.S. government health officials, medical organizations, laboratory and hospital associations and others stressed the overriding benefit of the vaccines. (AP Photo/Steven Senne)