HPV vaccine refers to human papillomavirus vaccine, currently there are three types: bivalent, quadrivalent, and nine-valent, you need to choose the right vaccine for you according to the age range, bivalent HPV vaccine is suitable for between 9~45 years old, quadrivalent HPV vaccine is suitable for between 20~45 years old, and nine-valent HPV vaccine is suitable for between 16~26 years old. 1. Bivalent: Bivalent HPV vaccine is applicable between the ages of 9~45 years old. Bivalent HPV vaccine mainly prevents high-risk HPV virus infections of types 16 and 18. 2. Quadrivalent: Quadrivalent HPV vaccine is suitable for people between 20 and 45 years old. Quadrivalent HPV vaccine mainly prevents type 16, type 18, type 6 and type 11 HPV virus infection. 3. Nine-valent: Nine-valent HPV vaccine is applicable between 16 and 26 years old. Nine-valent HPV vaccine is mainly used to prevent HPV virus infection of type 16, 18, 31, 33, 6, 11, 45, 52 and 58. The higher the vaccine valence, the more virus subtypes it prevents, so it is recommended to choose the vaccine that suits your needs within the specified age range.