Health officials in Solano County announced Sunday that two healthcare workers at the NorthBay VacaValley Hospital are being treated as presumptive positive cases for the coronavirus after their exposure to a female patient in recent weeks.

Solano County Health Officer Bela Matyas said the two healthcare workers had tested positive for the virus at the state level, but their tests still needed to be confirmed by the CDC. Both workers were in self-quarantine at home, one in Solano County and one in Alameda County, as ABC 7 reports.

The patient the workers had contact with, without the aid of protective gear, appears almost certainly to have been the Vacaville woman who presented symptoms of the virus and became the country's first documented case of community transmission of covid-19 last week. The woman had reportedly not been tested for the virus for several days, due to CDC protocols and the fact that she had no contact with travelers to affected countries, and later tested positive after being transferred to UC Davis Medical Center. The case led to the self-quarantining of dozens of healthcare workers who may have been exposed to the virus — a nurses' union last week said the number was 124, while UC Davis said that number was inaccurate.

Meanwhile on Monday, also in Solano County, an unknown number of Diamond Princess cruise evacuees are being released from their quarantine at Travis Air Force Base in two groups — while a few passengers who remain at risk of infection will remain in extended quarantine, as KRON 4 reports.

Over the weekend, the number of confirmed cases of the virus in Santa Clara County rose to seven. As the Chronicle reported, two of the new cases were a husband and wife who had recently traveled to Egypt, and one case was an adult woman with chronic health conditions who was hospitalized.

Also over the weekend, the U.S. recorded the first two deaths from the virus, both in Seattle suburbs. And scientists who did genetic sequencing on virus samples taken six weeks apart in Washington State believe that the virus has been spreading there, largely undetected, the entire time, as the New York Times reports.