An Aloha High School student has tested positive for novel coronavirus, the Washington County Health Department announced Wednesday.

The student, whose name and grade level were not released by the agency, attended class while sick during the week of March 9. It’s the second confirmed instance of a student in Washington County contracting coronavirus since a middle schooler in Hillsboro was announced as one of the state’s first 14 cases.

Beaverton district officials in a release said they’re working to track down close contacts of the student infected in Aloha.

The student’s presence at school while sick is of greatest concern not because fellow teens are likely to fall seriously ill but because they could contract and carry the disease while showing little or no symptom.

If that were the case, they could unknowingly spread it to close contacts. School officials have also expressed concerns about school employees older than 60 or with underlying medical conditions.

The novel coronavirus pandemic has grounded much of Oregon to a halt, including schools.

Gov. Kate Brown has ordered the state’s public schools to remain shuttered until April 28. That’s four weeks longer than an initial mandate that came after superintendents across Oregon relayed their troubles keeping buildings staffed as fears mounted among teachers and substitutes in vulnerable demographic groups.

Brown also ordered the state’s restaurants to suspend dining room operations and only fulfill takeout and delivery orders and banned gatherings of 25 or more people.

As of Tuesday night, three of the state’s confirmed cases in Washington County were children younger than 17. State officials on Wednesday said Oregon has 75 confirmed cases of coronavirus and three deaths.