A day after a steep increase in COVID-19 cases brought San Francisco’s total to 70, health officials reported six new cases Friday, bringing the total at week’s end to 76.

That is not quite double what the total was when the week began. The city reported its 40th case Monday. Thursday brought the sharpest increase yet, with 19 new cases.

Until Sunday, Santa Clara County, about 40 miles south of San Francisco, was the only county in the Bay Area to report a death caused by COVID-19. On Sunday, San Mateo County, which sits between Santa Clara and San Francisco, announced its first death. And on Friday, Contra Costa County reported its first.

As of Thursday, only Santa Clara (189) and San Mateo (89) counties have more cases in the Bay Area than San Francisco.