10-144-262 Me. Code R. § 6
A student not immunized or immune from a disease may be excluded from school when, in the opinion of a public health official, the student's continued presence in school poses a clear danger to the health of others. The chief administrative officer may be directed to exclude the student from school during the period of danger or for one incubation period following immunization, when one or more cases of disease are present in the school. An excluded student who was infected with a disease is permitted to return to school after the Department, in consultation with the physician responsible for the individual's care, determines that return is permissible and will not pose a threat to public health. An exempted student may be permitted to return to school by providing proof of immunity through laboratory results. An exempted student who receives immunization following the identification of a disease must wait one incubation period following the date of immunization before returning to school.
The documented occurrence of a single case of any of these diseases among students or staff may be interpreted as a clear danger to the health of others.
The following periods are defined as the "period of danger":
10-144 C.M.R. ch. 262, § 6