San Francisco declares state of emergency over coronavirus

The mayor of San Francisco declared a state of emergency over coronavirus fears on Tuesday shortly after the Centers for Disease Control and Prevention issued a warning that the U.S. will likely see more cases.

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There are 57 known cases in the U.S. and no cases in San Francisco, but Mayor London Breed pointed to the virus’ unpredictability and troubling global growth.

"We see the virus spreading in new parts of the world every day, and we are taking the necessary steps to protect San Franciscans from harm," Breed said. She said many of the city's residents travel to mainland China, so it is not far-fetched to suspect cases in the future.

U.C. San Francisco successfully treated two cases earlier this month, SFGate reported. The declaration is effective immediately and will be voted on early next month. The Los Angeles Times reported that San Diego and Santa Clara counties have made similar declarations.

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China, by far, still has the most cases and deaths from the illness, though its numbers have slowed recently. Chinese officials Wednesday reported another 406 cases and 52 additional deaths, all of them in hard-hit Hubei province and all but 10 in the epicenter of the city of Wuhan.

China has recorded 2,715 deaths from COVID-19 and 78,064 confirmed cases of the virus on the mainland since the illness emerged in December.

New outbreaks occurring in far-flung places were raising concerns about containing the illness and what will happen when it reaches new places.

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"It's not so much a question of if this will happen anymore, but rather more a question of exactly when this will happen -- and how many people in this country will have severe illness," Dr. Nancy Messonnier of the CDC said.

The Associated Press contributed to this report