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In this file photo, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, testifies at a Senate committee hearing on Tuesday, Jan. 11, 2022, on Capitol Hill in Washington. On March 23, 2022, Dr. Walensky said her agency is tracking the BA.2 omicron subvariant that caused spikes overseas but the strain, but that it does not appear to make infected persons any sicker and is not straining hospital capacity. (Shawn Thew/Pool via AP) ** FILE **

In this file photo, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, testifies at a Senate committee hearing on Tuesday, Jan. 11, 2022, on Capitol Hill in Washington. On March 23, 2022, Dr. Walensky said her agency is tracking the BA.2 omicron subvariant that caused spikes overseas but the strain, but that it does not appear to make infected persons any sicker and is not straining hospital capacity. (Shawn Thew/Pool via AP) ** FILE **

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