covid vaccine study

Booster Shots 90% Effective at Preventing Omicron Hospitalizations: CDC Data

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Booster Shots 90% Effective at Preventing Omicron Hospitalizations: CDC Data

Jan. 24, 2022 — Booster shots of the Pfizer and Moderna COVID-19 vaccines appear to be highly effective at preventing hospitalizations due to the Omicron variant, according to three new CDC studies published on Friday. The extra doses were 90% effective at keeping people out of the hospital after infection and 82% effective at preventing … Read more

Drop in COVID Vaccine Effectiveness Suggests Need for Boosters

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Drop in COVID Vaccine Effectiveness Suggests Need for Boosters

Dec. 10, 2021 — The effectiveness of the two most common COVID-19 vaccines declined over time in an older group of patients, suggesting that booster doses may be needed to protect recipients over the long term, according to a new study. Also seen in that group of U.S. veterans, who had a median age of … Read more