The Food and Drug Administration is telling Pfizer and Moderna to expand the warning labels on their COVID-19 vaccines about the risk of a possible heart injury side effect linked to the mRNA shots, primarily in teen boys and young men,

The FDA has updated COVID-19 vaccine regulations. Only people aged 65 and up, along with certain groups, will be eligible to receive booster shots. FDA officials are asking for more data around the vaccine’s effectiveness for people who are otherwise healthy.