The Omicron variant spreads more easily than the original virus that causes COVID19. Help stop Omicron by using all the tools to protect yourself and others. Learn more:
. As of December 20, 2021, Omicron has been detected in most states and territories and is rapidly increasing the proportion of COVID-19 cases it is causing.CDC is expecting a surge of COVID-19 cases in the coming days to weeks. Learn more about Omicron variant surveillance and potential rapid spread.CDC has been collaborating with global public health and industry partners to learn about Omicron, as we continue to monitor its course.
in people who are fully vaccinated are likely to occur. With other variants, like Delta, vaccines have remained effective at preventing severe illness, hospitalizations, and death. The recent emergence of Omicron further emphasizes the importance of vaccination and boosters.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.
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