Per NHSN definition, as of September 25, 2023, individuals are considered “up-to-date” with their COVID-19 vaccines if they meet one of the following criteria:
- Received a 2023-2024 updated COVID-19 vaccine OR
- Received a bivalent* COVID-19 vaccine within the last two months.
*Note that the bivalent vaccines are no longer authorized as of 9/12/2023.