<PERSON> wears a mask while walking her dog <PERSON> on Bernal Heights Hill in San Francisco, Monday, March 16, 2020. Officials in six San Francisco Bay Area counties issued a shelter-in-place mandate Monday affecting nearly 7 million people, including the city of San Francisco itself. The order says residents must stay inside and venture out only for necessities for three weeks starting Tuesday in a desperate attempt by officials to curb the spread of the novel coronavirus.