Nine-valent generally refers to the nine-valent HPV vaccine, which mainly prevents human papillomavirus (HPV) infection because when infected with HPV it may induce cervical cancer, vulvar cancer and other diseases. The types of HPV are generally divided into high-risk and low-risk types. High-risk HPV mainly causes cervical cancer, while low-risk HPV mainly causes warts in the genital tract, such as vulvar warts. Nowadays, the main method to prevent cervical cancer is HPV vaccination, which includes the nine-valent HPV vaccine. The age of nine-valent HPV vaccination is 16-26 years old, and the virus types targeted include HPV16, HPV18, HPV6, and HPV11, HPV31, HPV33, HPV45, HPV52, HPV58, which are generally injected according to the rule of 0, 2, 6. At present, cervical cancer vaccine also includes bivalent HPV vaccine and quadrivalent HPV vaccine. Bivalent HPV vaccine can prevent more than 70% of cervical cancer, and quadrivalent HPV vaccine can prevent acromegaly on top of bivalent vaccine. Make sure you are in good health before the nine-valent HPV vaccine is injected, and avoid the vaccine if you have other acute phase symptoms such as fever. If you already have a history of sexual intercourse, you should undergo HPV virus testing as well as TCT testing to rule out infection before receiving the nine-valent HPV vaccine. After receiving the nine-valent HPV vaccine, you should stay in the rest area for about 30 minutes to avoid allergic reactions and pay attention to protecting the injection site from water, which may lead to infection. If itching or swelling occurs at the injection site, it is recommended to avoid scratching and pressure, and the symptoms can be relieved on their own after 2-3 days.