California officials say their pizza ovens were at the heart of the outbreak, but the outbreak has since been spread to other regions.
A total of 4,541 people have died from the coronavirus outbreak, the state health department said on Friday.
There have been more than 2,000 new infections in hospitals.
The state also said on Thursday that 1,000 more people have been tested for the virus.
Amber Vazquez reports from Los Angeles.