Last updated 12/20/21. For the latest updates, visit https://www.cdc.gov/coronavirus/2019-ncov/variants/omicron-variant.html.

On November 24, 2021, a new variant of SARS-CoV-2, B.1.1.529, was reported to the World Health Organization (WHO). On November 26, 2021, WHO named the B.1.1.529 Omicron and classified it as a Variant of Concern (VOC). On November 30, 2021, the United States designated Omicron as a Variant of Concern, and on December 1, 2021 the first confirmed U.S. case of Omicron was identified.

OMICRON: What We Know

How easily does Omicron spread?

The Omicron variant likely will spread more easily than the original SARS-CoV-2 virus. CDC expects that anyone with Omicron infection can spread the virus to others, even if they are vaccinated or don’t have symptoms.

Will Omicron cause severe illness?

More data are needed to know if Omicron infections, and especially reinfections and breakthrough infections in people who are fully vaccinated, cause more severe illness or death than infection with other variants.

Will vaccines work?

Current vaccines are expected to protect against severe illness, hospitalizations, and deaths due to infection with the Omicron variant. However, breakthrough infections in people who are fully vaccinated are likely to occur.

Will treatments work?

Scientists are working to determine how well existing treatments for COVID-19 work. Based on the changed genetic make-up of Omicron, some treatments are likely to remain effective while others may be less effective.

We have the Tools

Vaccines remain the best public health measure to protect people from COVID-19, slow transmission, and reduce the likelihood of new variants emerging. Scientists are currently investigating Omicron, including how protected fully vaccinated people will be against infection, hospitalization, and death.

  • CDC recommends that everyone 5 years and older protect themselves from COVID-19 by getting fully vaccinated. CDC recommends that everyone ages 18 years and older should get a booster shot at least two months after their initial J&J/Janssen vaccine or six months after completing their primary COVID-19 vaccination series of Pfizer-BioNTech or Moderna.
  • Masks offer protection against all variants. CDC continues to recommend wearing a mask in public indoor settings in areas of substantial or high community transmission, regardless of vaccination status. CDC provides advice about masks for people who want to learn more about what type of mask is right for them depending on their circumstances.
  • Tests can tell you if you are currently infected with COVID-19. Two types of tests are used to test for current infection: nucleic acid amplification tests (NAATs) and antigen tests. NAAT and antigen tests can only tell you if you have a current infection. Individuals can use the COVID-19 Viral Testing Tool to help determine what kind of test to seek. Additional tests would be needed to determine if your infection was caused by Omicron. Visit your state, tribal, local, or territorial health department’s website to look for the latest local information on testing.
  • Self-tests can be used at home, are easy to use, and produce rapid results. If your self-test has a positive result, stay home or isolate for 10 days, wear a mask if you have contact with others, and call your healthcare provider. If you have any questions about your self-test result, call your doctor or public health department.

Until we know more about the risk of Omicron, it is important to use all tools available to protect yourself and others. Speak with your doctor about any concerns you may have. If you do not have a primary care provider, call The Wellness Coalition for assistance connecting to affordable healthcare.