13/01/2022

Effectiveness of Covid-19 Vaccines over a 9-Month Period in North Carolina

The duration of protection afforded by coronavirus disease 2019 (Covid-19) vaccines in the United States is unclear. Whether the increase in postvaccination infections during the summer of 2021 was caused by declining immunity over time, the emergence of the B.1.617.2 (delta) variant, or both is unknown.

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Immunological dysfunction persists for 8 months following initial mild-to-moderate SARS-CoV-2 infection
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Duration of Protection against Mild and Severe Disease by Covid-19 Vaccines