WASHINGTON—The federal government’s leading voice on infectious diseases said Americans will need to do much more to prevent community spread of the novel coronavirus, urging them to stay home and avoid unnecessary public outings.

“Americans should be prepared that they are going to have to hunker down significantly more than we as a country are doing,” Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said on NBC’s “Meet the Press.”

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