Dr. Anthony Fauci, the government’s top infectious disease expert, said Monday he plans to retire by the end of President Joe Biden’s term in January 2025. Fauci, 81, was appointed director of the National Institute of Allergy and Infectious Diseases in 1984, and has led research in HIV/AIDS, respiratory infections, Ebola, Zika and the coronavirus. He has advised seven presidents and is Biden’s chief medical adviser. In an interview with Politico, Fauci said he hoped to “leave behind an institution where I have picked the best people in the country, if not the world, who will continue my visio…