Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
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.
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.
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

COVID-19 By the Numbers

COVID-19 By the Numbers
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10,000 CDC personnel supporting the outbreak response

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1,893 have conducted 4,426 deployments to 353 cities across the United States and abroad.

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396 COVID-19 studies published in CDC’s Morbidity and Mortality Weekly Report (MMWR)

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747+ million COVID-19 tests conducted by public and private laboratories

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9,757 Documents providing information and guidance for government agencies, businesses, and the public

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59.01+ million times people have used CDC’s online Coronavirus Self-Checker

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1.6+ million calls and emails to CDC-INFO

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98,172+ inquiries from doctors, nurses, or other clinical staff and health departments received by CDC

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4.6+ billion social media impressions on 19,258 CDC social media posts on the outbreak

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3.7+ billion times people viewed information on CDC websites

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248+ million people who have received at least one dose of a COVID-19 vaccine

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208+ million people who have been fully vaccinated with a COVID-19 vaccine