US Stay Up to Date with COVID-19 Vaccines Including Boosters -
theold - 05-10-2022
Updated (Bivalent) Boosters
The updated (bivalent) boosters are called “bivalent” because they protect against both the original virus that causes COVID-19 and the Omicron variant BA.4 and BA.5.
Previous boosters are called “monovalent” because they were designed to protect against the original virus that causes COVID-19.
They also provide some protection against Omicron, but not as much as the updated (bivalent) boosters.
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/stay-up-to-date.html