Quadrivalent vaccine means that the vaccine protects against 4 types of human papillomavirus. The human papilloma quadrivalent vaccine is effective against diseases caused by HPV types 6, 11, 16 and 18. It prevents various diseases caused by the virus but does not treat them. The diseases may include pre-cancerous lesions of the female genitals, pre-cancerous lesions of the anus and genital warts in males as well as females, cervical and anal cancers.