SANTA CLARA COUNTY, Calif. (CNN) -- An older adult woman from California is the second case of unknown origin of the novel coronavirus, health officials in Santa Clara County said Friday.
The patient didn't have any relevant travel history or exposure to another known patient, said Dr. Sara Cody, director of the county's public health department.
The patient is a resident of the county, officials said.
"This new case indicates that there is evidence of community transmission, but the extent is still not clear," Cody said. "I understand this may be concerning to hear, but this is what we have been preparing for. Now we need to start taking additional actions to slow down the spread of the disease."
The woman had been hospitalized for a respiratory illness and her infectious disease doctor on Wednesday requested a coronavirus test. The case is not related to two others in the county, officials said.
"The virus is here present at some level, but we still don't know to what degree," Cody told reporters.