AUGUSTA, Maine (AP) Maine Center for Disease Control and Prevention says the percentage of unvaccinated children continues to creep upward in schools in the state.

The Maine CDC says that among kindergarteners the vaccination rate for measles, mumps and rubella has dropped to 93.8 percent.

Overall, the report indicates all vaccination requirements except chickenpox are below the so-called “herd” immunity level of 95 percent. Herd immunity occurs when a high percentage of people are immune to a disease, making the spread of disease unlikely, even among unvaccinated individuals.

Maine law allows students in public and private schools to be exempt from immunization for medical, religious or philosophical reasons.

The Maine CDC said kindergarten exemption rates are 6.2 percent, the highest since the state began keeping records in the 2009-2010 academic year.