Two Bay Area hospital workers test 'presumptive positive' for coronavirus

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Update: As of 4:35 p.m. on Sunday, there have been three more confirmed cases of the coronavirus in Santa Clara County, raising the total to seven.

According to the county's public health department, the fifth instance is a woman with chronic health conditions who has been hospitalized. The sixth and seventh confirmed cases are a husband and wife who had recently traveled to Egypt. The husband also had a history of chronic health conditions and both are now hospitalized.

The department said an increase in cases is not unexpected. They are now "conducting community surveillance" to determine the scale of the spread of the virus and will continue to identify any additional cases.

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Two Bay Area hospital staffers have been determined "presumptive positive" for coronavirus, public health officials announced.

They are employed by the NorthBay VacaValley Hospital in Vacaville, where a Solano County woman was treated before being tested positive for COVID-19 on Wednesday. Hers was believed the first U.S. case to be contracted without traveling abroad or coming in close contact with someone who had the virus.

Officials said both workers — one from Alameda County, the other from Solano County — had been exposed to the "community-acquired case" hospitalized at UC Davis Medical Center. They are currently in isolation at home and will not return to work until they are cleared.

“We took immediate and comprehensive measures intended to stop any further spread of the virus, including working with public health officials to trace the contacts the two workers may have had,” Aimee Brewer, president of NorthBay HealthCare Group, said in the news release.

In response, Alameda County has declared a local public health emergency, joining San Francisco, Santa Clara and San Diego.

RELATED: Second unexplained coronavirus case in California raises specter of spread

On the same day, officials verified a fourth case of coronavirus in Santa Clara county. According to the county's department of public health, the woman was "a household contact" of the third confirmed case reported Friday.

This is a developing story and will be updated with more information.

For more coverage, visit our complete coronavirus section here.

Amanda Bartlett is an SFGATE associate digital reporter. Email: amanda.bartlett@sfgate.com | Twitter: @byabartlett