Public health officials have confirmed three new cases of coronavirus in northern California, including an adult woman in Santa Clara County and a husband and wife in San Benito County.

The new case in Santa Clara County is not related to the first confirmed case in Santa Clara, announced on Friday, which involved a man who returned on Jan. 24 from Wuhan, China where the disease originated, according to a news release Sunday from the Santa Clara County Public Health Department.

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The Centers for Disease Control (CDC) informed Santa Clara County officials of the case Sunday morning.

“The two cases we’ve confirmed in our county to date are both travel associated … and both of them were essentially remaining in one residence since they came,” Santa Clara County Health Officer Dr. Sara Cody said at a press conference Sunday afternoon. “That’s why I don’t think these two cases change the risk to the general public.”

The woman, who is not a Santa Clara County resident, came to the area on Jan. 23 to visit family after recently visiting Wuhan. She has stayed at home since arriving, except for two occasions where she sought outpatient medical care, and “has been regularly monitored and was never sick enough to be hospitalized,” according to the news release.

The woman’s family members have also been isolated and have not left their home, according to Santa Clara officials, while the Public Health Department has provided food and other necessary items.

Santa Clara County said it will not release more information about the woman because the investigation is in its early stages.

In San Benito County, officials Sunday said that a 57-year-old man, who recently traveled to Wuhan, had contracted the illness, and passed it onto his 57-year-old wife, who did not travel, according to a news release.

Both individuals have not left their home since returning from China, according to San Benito County officials, who did not immediately answer questions about those two cases.

Santa Clara has been expecting and preparing for local cases of coronavirus because of the large number of travelers to the Bay Area, including many people traveling from China, Cody said.

“We anticipate we may find additional cases,” said Cody, adding that health officials expect new cases to taper off as travel from outside the country also falls with recent travel restrictions by the U.S., which were implemented Sunday, on air travel from China.

“It would not be surprising when we do have a new case due to close, household contact,” said Cody. “What would be significant is if we had a case without a history of travel, to an area where we know the virus is circulating without a known close contact.”

The first Santa Clara case involved a man who never became sick enough to require hospitalization and had contact with few people, according to county officials, but sought outpatient treatment twice. The county is also monitoring that man’s family members and others with whom he came in contact.

The respiratory illness, caused by a novel coronavirus, has been identified by health officials to have originated in Wuhan, the capital of China’s Hubei province. Most of the 14,550 confirmed cases of the infection worldwide are in China, where 304 people have died from the virus, according to the Associated Press.

This weekend, officials in the Philippines confirmed the death in that nation of a 44-year-old man from Wuhan, the first death from the illness outside of China. The man’s 38-year-old female companion, also from Wuhan, has also tested positive for the virus and was hospitalized in isolation in Manila.

The new confirmed case in Santa Clara County is the fourth in California and the ninth in the United States.

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People who experience those symptoms and have traveled to China, or had close contact with someone who has traveled to China in the last 14 days, should call ahead before seeking care at a doctor’s office or emergency room.

Despite the alarm about coronavirus, public health officials say influenza is still a far greater threat to most Americans, killing more than 61,000 people in the U.S. alone during the 2017-18 season, according to CDC estimates. Since the beginning of the current flu season on Oct. 1, there have been more than 8,200 deaths so far.

The best way to prevent the spread of any virus is to wash your hands, cover your mouth with a tissue, sleeve or arm when coughing or sneezing, and avoid contact with others, especially large gatherings, if you have respiratory symptoms.

Check back for updates.