Business Insider reports San Francisco Mayor London Breed has declared a state of emergency in the city.
The move comes in response to the coronavirus outbreak.
Beginning in China, it has spread to Asia, the Middle East, and Europe.
Breed said the city is "taking the necessary steps to protect San Franciscans from harm." There are currently 53 confirmed cases in the US.
Worldwide, more than 2,700 people have died from COVID-19 with more than 80,000 infected.