New Jersey Statutes Title 18A. Education 18A § 40-12

Whenever the board of health of any municipality shall declare any epidemic or cause of ill health to be so injurious or hazardous as to make it necessary to close any or all of the public schools in the municipality, the board shall immediately serve notice on the board of education of the school district situated in the municipality that it is desirable to close the school or schools. Upon receipt of the notice the board of education may close the schools under its control, or such of them as may be designated by the board of health. The schools so closed shall not be reopened until the board of education is satisfied that all danger from the epidemic or cause of ill health has been removed.