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The Santa Clara County Public Health Department announced Saturday the case of a fourth person in the county infected with coronavirus.

The case is of a woman who is a “household contact” of a person who is hospitalized with the virus, the health department said in a news release.

The woman has not been hospitalized and is not ill, the department said.

“We expected more cases of COVID-19 in our county and have been preparing for community transmission,” the department said. “Since the disease is here, an important priority for the department will be to conduct community surveillance to determine the extent of local spread.”