COVID-19 vaccine effectiveness for all age groups has been much worse against the Omicron virus variants than earlier strains, particularly the currently dominant subvariants, according to U.S. Centers for Disease Control and Prevention (CDC) data presented on Sept. 1.
The data, much of which hasn’t been previously published, show that the protection against both symptomatic infection and severe disease isn’t as strong against Omicron, which emerged in December 2021, and its subvariants.
