In this March 19, 2021, photo, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, leads President Joe Biden into the room for a COVID-19 briefing at the headquarters for the CDC Atlanta. Walensky is making an impassioned plea to Americans not to let their guard down in the fight against COVID-19. She warned on March 29 of a potential “fourth wave” of the virus. (AP Photo/Patrick Semansky)
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