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.

Science and Research

Science and Research
Woman with face mask using smart phone while reading her medical report in waiting room at the clinic.

COVID-19 by County

COVID-19 Community Levels help individuals and communities decide what prevention steps to take based on hospitalizations and cases.

Check Community Levels

Woman with face mask using smart phone while reading her medical report in waiting room at the clinic.
CDC's Science Agenda for COVID-19

Learn more about the high-level framework for planning and prioritization of COVID-19 work.

Recent CDC Articles
Journals and Studies
Archived Content

To find a list of content that has been archived for historical purposes, please visit our archive. Please note the content of these pages and files may be out of date as they are no longer being updated. View Archive.