Health officials say there are 10 laboratory confirmed cases of mumps in Latah County and another 20 possible cases, a high number for the area.
The Moscow-Pullman Daily News reports the cases include an elementary student as well as several college-aged students.
Mumps first appeared in 2014 on the Palouse in October, when two University of Idaho students were found to have the virus, followed by one Moscow elementary school student and several more UI students.
Public Health is investigating the situation.
Greg Tatham is assistant vice provost for student affairs at the University of Idaho. He has been working with Public Health to raise awareness with students through a health and hygiene campaign.