First 2 Coronavirus Cases Identified In San Francisco

: San Francisco Mayor London Breed speaks during a news conference at the future site of a Transitional Age Youth Navigation Center on January 15, 2020.
Photo credit Justin Sullivan/Getty Images

Two patients have been diagnosed with the coronavirus in San Francisco, Mayor London Breed said Thursday.

They are the city's first cases in the global outbreak. 

One patient is a man in his 90s. The other is a woman in her 40s. Neither has a travel history that could possibly explain how they came to be infected, city health officials said.

The elderly man is in serious condition in a hospital. The woman, hospitalized at a different, unnamed institution, is in fair condition. 

Last week, Breed declared an emergency as the city anticipated that residents would be diagnosed with the virus.