13. Procedure when child is unfit for vaccination. A certificate granted under section nine showing the unfitness of a child for vaccination shall remain in force for the period stated therein, and on the termination of that period, or, if that period terminates after the vaccination- season is over, when the next vaccination season begins, the parent or guardian of such child shall take the child, or cause it to be taken, to a vaccinator to be vaccinated, or procure its vaccination at his own house by a vaccinator:
