covid vaccine protection

Fourth vaccine dose protects elderly from Covid but protection wanes quickly: Study

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Fourth vaccine dose protects elderly from Covid but protection wanes quickly: Study

A fourth dose of the Pfizer vaccine lowered rates of COVID-19 among people aged 60 years or older but protection against the infection appeared short-lived, according to a large-scale study conducted in Israel. The study, published in New England Journal of Medicine on Tuesday, used the Israeli Ministry of Health database to extract data on … 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