Science brief : Background rationale and evidence for public health recommendations for fully vaccinated people
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CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners. As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
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Science brief : Background rationale and evidence for public health recommendations for fully vaccinated people

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English

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    Updated Mar. 8, 2021

    Key Points

    • COVID-19 vaccines currently authorized in the United States are effective against COVID-19, including severe disease.

    • Preliminary evidence suggests that the currently authorized COVID-19 vaccines may provide some protection against a variety of strains, including B.1.1.7 (originally identified in the United Kingdom). However, reduced antibody neutralization and efficacy have been observed for the B.1.351 strain (originally identified in South Africa).

    • A growing body of evidence suggests that fully vaccinated people are less likely to have asymptomatic infection and potentially less likely to transmit SARS-CoV-2 to others. However, further investigation is ongoing.

    • Modeling studies suggest that preventive measures such as mask use and social distancing will continue to be important during vaccine implementation. However, there are ways to take a balanced approach by allowing vaccinated people to resume some lower-risk activities.

    • Taking steps towards relaxing certain measures for vaccinated persons may help improve COVID-19 vaccine acceptance and uptake.

    • The risks of SARS-CoV-2 infection in fully vaccinated people cannot be completely eliminated as long as there is continued community transmission of the virus. Vaccinated people could potentially still get COVID-19 and spread it to others. However, the benefits of relaxing some measures such as quarantine requirements and reducing social isolation may outweigh the residual risk of fully vaccinated people becoming ill with COVID-19 or transmitting the virus to others.

    • Guidance for fully vaccinated people is available and will continue to be updated as more information becomes available.

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