Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

Reinfection

Reinfection

Clinical considerations for care of children and adults with confirmed COVID-19

Updated May 27, 2022
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Studies suggest that reinfection with SARS-CoV-2 with the same virus variant as the initial infection or reinfection with a different variant are both possible; early reinfection within 90 days of the initial infection can occur.(99-101) Symptoms during reinfection are likely to be less severe than during the initial infection, but some people can experience more severe COVID-19 during reinfection.(99,100,102,103) Both previous infection and vaccination have been shown to provide some protection against infection, although risk of reinfection varies by circulating variant(104-107) Although rates of reinfection might change as new variants emerge, vaccination remains the safest strategy for preventing future SARS-CoV-2 infections, hospitalizations, long-term sequelae, and death. Staying up to date on primary vaccination, additional doses, and booster doses, is recommended for all eligible persons. Strategies to diagnose and treat reinfection are no different than those used to diagnose and treat initial COVID-19 infection; early testing, isolation, and treatment as indicated are recommended for all people who experience symptoms of COVID-19.

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References