23 "As of May 1, 2021, CDC transitioned from monitoring all reported vaccine breakthrough cases to focus on identifying and investigating only hospitalized or fatal cases due to any cause." Source: CDC (www.cdc.gov) posted 3 years ago by MrEvangelon1 3 years ago by MrEvangelon1 +23 / -0 0 comments share 0 comments share save hide report block hide replies