Protection against infection offered by fourth Covid-19 vaccine dose wanes quickly, Israeli study finds

A fourth dose of the Pfizer/BioNTech Covid-19 vaccine seems to offer short-lived protection against infection overall, but protection against severe illness did not wane for at least several weeks, according to a new study.

(SOURCE) https://www.cnn.com/2022/04/05/health/israel-fourth-dose-study/index.html

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