We have each had the honor and privilege of serving as director of the Centers for Disease Control and Prevention, either in a permanent or an acting capacity, dating back to 1977. Collectively, we spent more than 100 years working at the C.D.C., the world’s pre-eminent public health agency. We served under multiple Republican and Democratic administrations — every president from Jimmy Carter to Donald Trump — alongside thousands of dedicated staff members who shared our commitment to saving...