Why has San Francisco thus far been spared the worst of COVID-19’s impact? On Monday, the city reported 374 cases, with six deaths, a fraction of the state’s 7,414 cases. Doctors have yet to see the surge in coronavirus cases that has overwhelmed hospitals in New York City, which has 38,087 confirmed cases and 914 deaths in all. Density might explain some of the discrepancies with New York City.