MORGAN HILL (CBS SF) — Norovirus is suspected of causing several students to get sick at a school in Santa Clara County.

The illness affected students at Nordstrom Elementary In Morgan Hill.

The principal sent a letter to students and staff that read, “We believe the situation is contained to one classroom. It appears that the illness may be caused by norovirus.”

The school is cleaning that classroom and several common areas that may have been affected.