OVERLAND PARK, Kan. (AP) — Officials at a University of Kansas Hospital youth services center say up to 18 people have fallen ill in the last few days.

State health officials told the hospital to treat the illnesses at the Marillac campus as norovirus, although results of hospital tests have not been confirmed.

Marillac provides behavior health services to young people.

The university said in a news release Thursday that 10 patients and eight staff reported illnesses at the Overland Park campus.

The hospital said the staff began cleaning the center was soon as the symptoms surfaced and outside cleaning experts began working at Marillac Thursday.

Marillac will not accept more inpatients until the situation is resolved.