“Conclusions: These findings indicate that immunity against the delta variant of SARS-CoV-2 waned in all age groups a few months after receipt of the second dose of vaccine…
Discussion: … [A]pproximately two thirds of the cases of severe Covid-19 in Israel during the study period [July 11 to 31, 2021] occurred in persons who had received two doses of the BNT162b2 vaccine [Pfizer-BioNTech].”
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