Variant

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Drugmaker executive predicts a "material drop" in the efficacy of existing vaccines against the new variant. ...
CDC Director Dr. Rochelle Walensky says the new omicron variant of the coronavirus "emphasizes the importance of vaccination, boosters, and prevention efforts needed to protect against COVID-19." ...
New coronavirus variant, Omicron has now been detected in the U.S for the first time. MSNBC's Chris Jansing is joined by John Hopkins Center for Health Security scholar Dr. Amesh Adalja to discuss how Americans can prevent further spread throughout the country. ...
The first U.S. case of the omicron variant has been found in a fully vaccinated traveler who returned to California from South Africa. ...

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