Gardasil 9 immunises against the 9 strains of HPV (6, 11, 16, 18, 31, 33, 45, 52, and 58) that cause the majority of genital warts and cancers of the anus, vulva, vagina and cervix.
HPV is transmitted during sex, or skin to skin contact with the genitals.
The vaccine is made from proteins that mimic HPV. When the vaccine is given, the body responds by making antibodies to get rid of it. If you are then exposed to the real virus, those same antibodies prevent it from entering cells and creating an infection which can ultimately lead to warts or cancer. The vaccine does not contain any live virus, so it cannot cause cancer or other HPV-related illnesses.