BOZEMAN, Mont. (AP) -- Heath officials in Gallatin County say they've confirmed 15 cases of whooping cough, including 14 at Bozeman High School.

School officials say about 350 students are on five-day courses of treatment to prevent them from getting the highly contagious bacterial infection that causes uncontrollable, violent coughing.

hose being treated have had close contact with those who are infected.

Superintendent Kirk Miller says school officials expect the number of sick students to increase.

Gallatin City-County Health Department spokesman Matt Kelley says one case of pertussis was reported at a daycare.

Bozeman Deaconess Hospital isn't allowing visitors with a cough or a fever to visit hospital patients.

State health officials say there are no other whooping cough outbreaks in the state.