Fourth Pfizer Dose Better for Severe Than Symptomatic COVID: Study - Medscape

Compared with a third dose, a fourth dose was found to be 45% more effective against infection and 74% more effective against death. But a leading expert says it "will have no impact on this pandemic."

Editor's note: Find the latest COVID-19 news and guidance in Medscape's Coronavirus Resource Center. A fourth dose of the Pfizer-BioNTech vaccine is effective in reducing the short-term risk for COV… [+6169 chars]

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