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FILE - In this Dec. 8, 2020 file photo, Rochelle Walensky, speaks during an event at The Queen theater in Wilmington, Del. The U.S. is scrambling to expand DNA mapping of coronavirus samples to identify potentially deadlier mutations starting to spread around the country.(AP Photo/Susan Walsh)

FILE - In this Dec. 8, 2020 file photo, Rochelle Walensky, speaks during an event at The Queen theater in Wilmington, Del. The U.S. is scrambling to expand DNA mapping of coronavirus samples to identify potentially deadlier mutations starting to spread around the country.(AP Photo/Susan Walsh)

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