The C.D.C. advises some people wait longer between the first and second dose of the Pfizer or Moderna vaccines.

Young men between the age of 12 and 39 are especially encouraged to wait eight weeks before the second dose to decrease the risk of myocarditis, the agency said.Young men between the age of 12 and 39 are especially encouraged to wait eight weeks before the second dose to decrease the risk of myocarditis, the agency said.Read More