Vaccine Efficacy

Vaccine efficacy after 1 dose was 66.3% in preventing symptomatic, laboratory-confirmed COVID-19 at least 14 days after vaccination among persons without evidence of previous SARS-CoV-2 infection.

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The Advisory Committee on Immunization Practices’ Interim Recommendation for Use of Janssen COVID-19 Vaccine — United States, February 2021


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Page last reviewed: August 23, 2021