California researchers test everybody in one town for coronavirus

The testing in Bolinas is the first of a two-part study in which UCSF researchers will examine the spread of the disease in both rural and urban areas.

Researchers have chosen the Mission District, a vibrant inner city neighborhood with Latino roots in San Francisco, for the second location. Testing will start there on Saturday.

"There are two paired sites that are going on right now: One here in Bolinas, which is very rural and people are quite separated and it's isolated. And another, less than an hour's drive away, in the Mission District of San Francisco, where it's very densely populated, people live very close to each other, and it's very connected," said Dr. Bryan Greenhouse, an assistant professor at UCSF and one of the study's researchers.

"By sort of bookending the different types of communities that we're evaluating within a short period of time, we hope to be able to extrapolate much more to different places throughout northern California."