https://www.mercurynews.com/2020/04/02/coronavirus-clusters-emerging-around-bay-area-heres-what-we-know-why-dont-we-know-more/

As the deadly coronavirus spreads, infections are emerging in alarming clusters among people who were in close contact, often before anyone felt sick. It’s happening at Bay Area nursing homes, Sacramento churches, a Vacaville hospital, on cruise ships and at a Santa Clara County workplace referenced in a recent study where five were infected.

But how much the public is allowed to know about these and other hot spots depends on the health official in charge where you live. In Los Angeles, you can see online how the county’s more than 3,000 confirmed cases are dispersed among cities and neighborhoods, the infection rate based on their population and nursing homes with outbreaks.