CNN —Dr. Rochelle Walensky, director of the US Centers for Disease Control and Prevention, tested positive for Covid-19 Friday. Walensky is experiencing mild symptoms and is up-to-date on her Covid-19 vaccines, according to a statement released by the agency. Walensky received an updated Covid-19 booster in September. The updated Covid-19 booster shots are bivalent, meaning they target the original coronavirus strain as well as the Omicron BA.4/BA.5 subvariants. The booster doses are recommended to given at least two months after the last dose of any Covid-19 vaccine and up to three months after an infection.

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