Maine Center for Disease Control officials say the state is experiencing a record number of chicken pox cases for the 2014-2015 school year.
The Portland Press Herald reports Maine has had 84 cases so far, nearly double the 2013-2014 school year.
Most cases have been infections of unvaccinated or under-immunized children. Of the 84 cases, 57 were in unvaccinated or under-vaccinated children, including those too young to receive the vaccine.
Maine has one of the highest voluntary opt-out rates in the country for parents choosing not to vaccinate their children.
Officials say chicken pox has been reported in every Maine county except for Washington County.