Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
To maximize protection from the Delta variant and prevent possibly spreading it to others, get vaccinated as soon as you can and wear a mask indoors in public if you are in an area of substantial or high transmission.
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.

Laws and Regulations

Laws and Regulations
People with masks going in and out of a COVID-19 mobile test site.

To help prevent the spread of COVID-19 and help our country cope during the pandemic, CDC has occasionally issued legally binding orders and regulations.

  • COVID-19 Test or Proof of Recovery Needed for Arrival in the US
    Air passengers arriving in the United States from a foreign country must present a negative COVID-19 test before boarding their flights. The test must not be more than three days old. Alternatively, passengers may present documentation showing that they have recovered from COVID-19.
U.S. Government Response

For information about other U.S. government programs related to the COVID-19 pandemic, click hereexternal icon.