After each long day of working on the United States’ pandemic response, the nation’s top infectious-disease expert power-walks through his Northwest Washington neighborhood with his wife and their daughter’s dog. Recently, Anthony S. Fauci’s nightly jaunts through the neighborhood where he has lived since 1977 have taken him past at least a dozen signs bearing his name — tokens of appreciation for his staid service on the White House coronavirus task force. “I have been, for so long, a quiet, inconspicuous person in my neighborhood, and now there are signs up telling me that they love me,” Fauci marveled on...