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Dr. Daniel Winetsky, an infectious diseases fellow at Columbia University, said his advice to his own parents, who in San Francisco, has shifted dramatically.

Earlier research suggests that for every documented, confirmed case, seven or more people are infected but not diagnosed, said Jeffrey Shaman, a Columbia University scientist.

Editor's Note: Craig Spencer, an assistant professor of emergency medicine and population and family health, helps viewers understand the role they can play in slowing the spread of the coronavirus.