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Pfizer Shot Just 39% Effective Against Delta Infection, But Largely Prevents Severe Illness, Israel Study Suggests
Previous estimates indicated the Pfizer shot was only moderately less protective against Delta, though all studies indicate a high level of protection against hospitalization and severe illness.www.forbes.com
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91%. That’s how effective the Pfizer vaccine is at preventing serious illness and hospitalization caused by the Delta variant after two doses, according to the Israeli study. This is only slightly lower than against other variants. As this is the primary purpose of a vaccine, it is still highly successful, though it does mean it will likely not be sufficient to stop outbreaks on its own.