Clark County Public Health has 12 people under its supervision protocol for novel coronavirus, but none of them are showing symptoms of the disease.

All 12 people have been placed under supervision because they traveled to mainland China within the last 14 days. Public Health is asking that they stay home during the two-week period following their return to the U.S.

At one point, Public Health was monitoring as many as 15 people, but three people recently passed through the 14-day threshold without exhibiting any symptoms of coronavirus disease 2019, or COVID-19, according to Clark County Public Health Officer Dr. Alan Melnick.

“They’re not the highest risk,” Melnick said.

The Centers for Disease Control and Prevention has set up a federal quarantine guidance for COVID-19 that calls for anyone currently returning from mainland China to undergo a health screening upon arrival in the U.S. It also calls for those people to self-monitor themselves, and avoid public gathering places such as school and work for up to 14 days.

There are 322 people in Washington under public health supervision, according to Washington Department of Health statistics. So far, only one case has tested positive in the state — a man in Snohomish County. There have been 31 total novel coronavirus tests in Washington, with 26 negatives tests, one positive test and four pending results.