5. If any Inspector or medical practitioner shall be of opinion that any child is not in a fit state to be vaccinated, he shall forthwith deliver to the parent or guardian of such child a certificate under his hand according to the form of Schedule A hereto annexed, or to the like effect, that the child is then in a state unfit for vaccination. The said certificate shall remain in force for one month only, but shall be renewable for successive periods of one month until the Inspector or medical practitioner shall deem the child to be in a fit state for vaccination, when the child shall, with all reasonable despatch, be vaccinated, and a certificate of successful vaccination given in the form of Schedule C hereto annexed according to the provisions of section 7 if warranted by the result.