The nation’s top infectious disease expert, Dr. Anthony Fauci, plans to step down from his roles running the National Institute of Allergy and Infectious Diseases and advising the White House as its chief medical advisor at the end of the year, he announced Monday.

Fauci has become a household fixture during the Covid-19 pandemic, battling back misinformation — sometimes from the highest levels of government. His steadfast commitment to science, challenging former President Donald Trump on everything from the use of hydroxychloroquine to mask mandates, made him a quasi-celebrity in the process.

The 81-year-old has advised seven U.S. presidents, starting with Ronald Reagan through the HIV/AIDS epidemic, West Nile virus, the 2001 anthrax attacks, pandemic influenza, various bird influenza threats, Ebola, Zika and, most recently, Covid and monkeypox. Fauci, who also runs the NIAID Laboratory of Immunoregulation, said he has no intentions of retiring.

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