Article

Effectiveness of Covid-19 Vaccines in the United States Over 9 Months: Surveillance Data from the State of North Carolina

2021-10-26

Abstract excerpt

<h4>ABSTRACT</h4> <h4>Background</h4> The duration of protection afforded by Covid-19 vaccines in the United States is unclear. Whether the recent increase of breakthrough infections was caused by waning immunity to the primary vaccination or by emergence of new variants that are more highly transmissible is also unknown. <h4>Methods</h4> We extracted data on vaccination histories and clinical outcomes (Covid-19,...

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Literature Corpus work: 354d6456-d1bd-546c-ab61-f541663a4260
DOI: 10.1101/2021.10.25.21265304

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