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
Updated Mar. 27, 2023

10,397 CDC personnel supporting the outbreak response

1,948 CDC deployers have conducted 4,780 deployments to 381cities across the United States and abroad.

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

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1+ billion COVID-19 tests conducted by public and private laboratories

12,384 Documents providing information and guidance for government agencies, businesses, and the public

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

1.9+ million calls and emails to CDC-INFO

116,556 inquiries from doctors, nurses, or other clinical staff and health departments received by CDC

5.1+ billion social media impressions on 22,101 CDC social media posts on the outbreak

4.4+ billion times people viewed information on CDC websites

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

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