PRO/AH/EDR> COVID-19 update (248): immunity and variants, vaccines, azithromycin, WHO

COVID-19 -- Worldwide/Unknown
Abstract
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The emergence of SARS-CoV-2 variants with mutations in major neutralizing antibody-binding sites can affect humoral immunity induced by infection or vaccination (1-6). We analysed the development of anti-SARS-CoV-2 antibody and T cell responses in previously infected (recovered) or uninfected (naive) individuals that received mRNA vaccines to SARS-CoV-2. While previously infected individuals sustained higher antibody titers than uninfected individuals post-vaccination, the

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