Where child is insusceptible

If any public vaccinator or surgeon finds that a child whom he has three times unsuccessfully vaccinated is insusceptible of successful vaccination or that a child brought to him for vaccination has already had smallpox or has been successfully vaccinated, he shall forthwith deliver to the parent a certificate under his hand according to the form of the Seventh Schedule or to the like effect, and within seven days shall also send to the Registrar for the district where the child resides a certified copy of such certificate, and the parent shall thenceforth not be required to cause the child to be vaccinated.