Effectiveness of Bivalent Boosters against Severe Omicron Infection

A meta-analysis of 65 studies finds that prior COVID-19 infection confers substantial protection against pre-omicron variants, but not Omicron BA.1. Regardless, the authors conclude the level of protection from past infections is equal to, if not greater than, that provided by two-dose mRNA vaccines

Omicron subvariant XBB.1.5 appears to be a ‘vaccine breaker’ — New variant of the novel coronavirus now makes up more than half of U.S. COVID-19 cases, and is on track to be the country’s most dominant strain (30 Jan. 2023)

Covid Vaccines Targeting Omicron Should Be Standard, Panel Says