The nine-valent vaccine usually refers to the HPV nine-valent vaccine, which is a vaccine used to prevent HPV virus, or human papillomavirus, infection. Although the nine-valent vaccine is not a mandatory vaccination, it is usually recommended for women aged 16-26 years old, except for HPV virus infection or other underlying diseases such as abnormal liver and kidney function, protein allergy, and other diseases. In general, the nine-valent vaccine can prevent nine types of HPV infection, including HPV types 6, 11, 16, 18, 31, 33, 45, 52 and 58, so it can largely reduce diseases such as condyloma acuminata and cervical cancer caused by HPV infection. Especially cervical cancer is a malignant tumor disease mainly caused by HPV virus infection, which is more harmful to women’s physical health, so it is recommended that eligible women can be vaccinated against HPV virus regardless of whether they have sex or not. Of course, the nine-valent vaccine is not the only cervical vaccine. You can also choose the quadrivalent or bivalent HPV vaccine, which can also reduce HPV infection to some extent. The quadrivalent HPV vaccine is given at the age of 20-45 years old, and the bivalent vaccine is given at the age of 9-45 years old. Even if you have received the nine-valent vaccine, you should have regular HPV and TCT screening of the cervix, because the nine-valent vaccine does not provide complete prevention of HPV virus, so it is recommended to have regular checkups and timely treatment if cervical cancer is detected to reduce the adverse effects on the body.