Contra Costa County is enforcing a new order in hopes of limiting the spread of the coronavirus.
Officials announced on Saturday, a legal order prohibiting gatherings of 100 or more people.
Dr. Ori Tzvieli said the number was reached through "careful thought," by communicating with the health departments of other Bay Area counties, while also taking under consideration, the current situation in Contra Costa County.
Dr. Tzvieli said the number of confirmed cases rose from 25 to 29, which he believed made the county, the "second most " in the Bay Area, behind Santa Clara County's 91 on Saturday.
While police are not being instructed to openly search for large gatherings, he said that officers will have the authority to limit the size of events, such as parties, if they encounter them.
Dr. Tzvieli stressed the importance of "social distancing" -- creating space among people at any gathering.
Due to the difficulties of finding coronavirus tests, he recommended that only people who show symptoms should be tested.
Symptoms include a high fever, and continued cough.