CDC Changed Definition of ‘Vaccine’ Because of COVID-19 Vaccines: Emails

The Centers for Disease Control and Prevention headquarters is seen in Atlanta, Ga., in a file photograph. Tami Chappell/Reuters

The Centers for Disease Control and Prevention (CDC) altered the definition of “vaccine” because of concern that the definition didn’t apply to COVID-19 vaccines, according to newly released internal emails.

The agency updated its definition on Sept. 1.