Omicron Variant: What You Need to Know
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.
Science evolves as new facts are uncovered and our understanding of COVID-19 grows. Read a changing selection of developing stories about COVID-related issues and learn about past pandemics. Putting the current moment in historic context can help us make choices that have the power to improve our nation's future.
Last update: February 4, 2022