Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, attends a Senate Health, Education, Labor, and Pensions Committee hearing to examine the federal response to the coronavirus disease (COVID-19) and new emerging variants at Capitol Hill in Washington, D.C., U.S. January 11, 2022.Greg Nash | ReutersDr. Anthony Fauci, the leader of the U.S. government’s Covid pandemic response effort, has tested positive for the coronavirus.Fauci, who is fully vaccinated and twice boosted against Covid, is experiencing mild symptoms, according to a statement Wednesday from the National Institute of Allergy and Infectious Diseases, which he leads.”Dr. Fauci will isolate and continue to work from home,” the statement said. “He has not recently been in close contact with President [Joe] Biden or other senior government officials.”In addition to being director of NIAID, which is a division of the National Institutes of Health, the 81-year-old Fauci also is Biden’s chief medical advisor.NIAID said in its statement that Fauci will follow Covid-19 guidelines issued by the federal Centers for Disease Control and Prevention, and “medical advice from his physician and return to NIH when he tests negative.”The infectious disease expert has been the public face of the response to Covid since the pandemic began in earnest in the United States in March 2020. Fauci’s promotion of coronavirus mitigation efforts, including social distancing, wearing masks and, when they became available, vaccinations, made him a hero to many. But he also drew criticism from others who believed official responses to Covid were too heavy-handed.Fauci had often chafed in his role under then-President Donald Trump, who significantly downplayed the risk of Covid when it first broke out in China, and who had criticized Fauci at times.Last month, Fauci told CNN he would not continue in his role as White House chief medical advisor if Trump won a second term as president in 2024.”If you look at the history of what the response was during the [Trump] administration, I think, you know, at best you could say it wasn’t optimal,” Fauci said in that interview.”And I think just history will speak for itself about that.”Nearly 86 million Americans have been infected with Covid in the past 18 months. Slightly more than 1 million people in the U.S. have died from the virus, according to the Coronavirus Resource Center at Johns Hopkins University of Medicine.