A second presumptive case of new coronavirus has been identified in Pima County, bringing the total number of cases in Arizona up to 10.

The Pima County Health Department announced the new case through a written statement released Friday evening. The department is still investigating how the person contracted the virus and whom they may have exposed.

"The Health Department was notified Friday afternoon and is working hard to learn more about this individual’s potential exposure to the virus," the statement reads. "At this time there is no clear link between this case and the presumptive case identified in Pima County on March 9th."

"Household contacts" remain under home isolation, the press release states.

The department said the person recently traveled to another state but didn't specify which state or whether the person contracted the virus during travel.

The case is presumed positive and the sample will be sent to the Centers for Disease Control in Atlanta for confirmation.

Testing is increasing. A total of 143 people in the state have been tested for the new virus, also called COVID-19, the state's numbers say. Forty test results were pending as of Friday evening and test samples belonging to 94 people have been ruled negative.

The Maricopa County Department of Public Health this week put out a notice that commercial testing for COVID-19 is now available for physicians and other health care providers to order for patients who are ill with signs and symptoms consistent with COVID-19 but do not meet the Maricopa County Public Health testing criteria at the state lab.

The state has been focusing on testing people who have traveled to an area affected by new coronavirus; people who have had direct contact with an infected person; and people with severe illness.

Commercial testing via nasal and cheek swabs began this week through LabCorp and Sonora Quest. Public health officials say people should not go to the company laboratories, but rather, they should see their health provider.

Clinicians and lab technicians should not call the public health department to coordinate commercial testing, county officials say. Patients may not order the test directly.

The incubation period for new coronavirus is two to 14 days. If anyone has symptoms and has trouble getting tested, health officials advise staying home until the symptoms are gone.

Symptoms of new coronavirus include fever, cough and shortness of breath that can cause pneumonia. It's also flu season, so those symptoms could also be a sign of flu or other respiratory illness.

There's no known prevention or treatment for new coronavirus.

The only treatment is supportive — rest, liquids and in more severe cases, breathing assistance.

A COVID-19 information hotline has been set up at 1-844-542-8201 for people with questions about the new coronavirus, including where testing is available.

Reach health care reporter Stephanie Innes at Stephanie.Innes@gannett.com or at 602-444-8369. Follow her on Twitter @stephanieinnes

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