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.
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.

Ensuring COVID-19 Vaccines Work

Ensuring COVID-19 Vaccines Work
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Vaccine Effectiveness

  • All COVID-19 vaccines currently available in the United States are effective at preventing COVID-19 as seen in clinical trial settings.
  • Research provides growing evidence that mRNA COVID-19 vaccines offer similar protection in real world conditions.
  • COVID-19 vaccination is an important tool to help stop the COVID-19 pandemic.
  • COVID-19 vaccination helps protect people from getting sick or severely ill with COVID-19 and might also help protect people around them.
  • To receive the most protection, people should receive all recommended doses of a COVID-19 vaccine.
  • Some people who are fully vaccinated against COVID-19 will still get sick because no vaccine is 100% effective. Experts continue to monitor and evaluate how often this occurs, how severe their illness is, and how likely a vaccinated person is to spread COVID-19 to others.
  • CDC recommends you get a COVID-19 vaccine as soon as one is available to you.

Do COVID-19 vaccines work?
Are COVID-19 vaccines safe?

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