More than 20 U.S. states now require face masks, as officials hope to curb a sharp rise in new coronavirus cases. Here, patrons wear masks as they sit in the outdoor patio of a restaurant on Pier 39 at Fisherman’s Wharf in San Francisco.

More than 20 U.S. states now require face masks, as officials hope to curb a sharp rise in new coronavirus cases. Here, patrons wear masks as they sit in the outdoor patio of a restaurant on Pier 39 at Fisherman’s Wharf in San Francisco.