On Jan. 20, I will begin leading the C.D.C., which was founded in 1946 to meet precisely the kinds of challenges posed by this pandemic. I agreed to serve as C.D.C. director because I believe in the agency’s mission and commitment to knowledge, statistics and guidance. I will do so by leading with facts, science and integrity — and being accountable for them, as the C.D.C. has done since its founding 75 years ago.

I acknowledge that our team of scientists will have to work very hard to restore public trust in the C.D.C., at home and abroad, because it has been undermined over the last year. In that time, numerous reports stated that White House officials interfered with official guidance issued by the C.D.C.

As chief of the infectious diseases division at Massachusetts General Hospital, I and many others found these reports to be extremely disturbing. The C.D.C.’s science — the gold standard for the nation’s public health — has been tarnished. Hospitals, doctors, state health officials and others rely on the guidance of the C.D.C., not just for Covid-19 policies around quarantine, isolation, testing and vaccination, but also for staying healthy while traveling, strategies to prevent obesity, information on food safety and more.