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Two doses of the Pfizer or Moderna COVID-19 vaccine were less effective at preventing hospitalizations during the omicron BA.2 and BA.2.12.1 periods than during the BA.1 period, but a third and fourth dose provided additional protection to eligible adults, the Centers for Disease Control and Prevention  Friday. Based on data from 10 states, two doses were 61% effective against hospitalization during the BA.1 period and 24% effective during the BA.2/BA.2.12.1 period, increasing to 85%-92% and 52%-69% effective, respectively, after a third dose. Among adults aged 50 and older, vaccine effectiveness against hospitalization during BA.2/BA.2.12.1 increased to 80% after a fourth dose, the study found.

“Getting vaccinated now will not prevent you from getting an authorized variant-specific vaccine in the fall or winter when they are recommended for you,” CDC . “Given recent increases in deaths and hospitalizations associated with the BA.5 variant, everyone should stay up to date with recommended COVID-19 vaccinations, including additional booster doses for those who are moderately to severely immunocompromised and adults over 50.”