MISSOULA, Mont. -

Pertussis cases in Missoula County have been held under 10 since January, but health officers are still stressing prevention.

The County Health Department just passed new regulations for drop-in day care facilities. The biggest change will be required immunization records for all kids before they can be checked in.

The department says the rules fill in a prevention gap for diseases like pertussis.

"The kids - that's really what it comes down, the protection of the children in these facilities,? said Missoula County Health Worker Alicia Johnson. ?Really giving providers the best information that they need so they can provide a safe service."

Johnson said the County Health department will publish the full list of drop-in day care regulations in the next few weeks. The rules take effect September 1.