There's one more pertussis case in Ravalli County. The age or hometown of the patient was not available late Thursday afternoon.

But it means there are now 29 whooping cough cases in the Bitterroot. Almost all of them are children.

The Ravalli County health officer ordered students who are not up to date on their pertussis vaccinations to stay home for 21 days. Cases have been reported in Pinesdale, Corvallis, Victor and Hamilton.