Nine-valent vaccine is a type of human papillomavirus vaccine, which mainly prevents diseases such as cervical cancer, condyloma acuminatum and vaginal cancer. The age group for the nine-valent vaccine is 16-26 years old, and the earlier you get the vaccine in this age group, the more it helps to prevent diseases. It can prevent HPV types 16, 18, 6 and 11, as well as types 31, 33, 45, 52 and 58. The nine-valent vaccine is effective in reducing persistent HPV infections and pre-cancerous lesions of the cervix, vagina, and external genitalia of the corresponding types, with a protection efficacy of more than 90 percent. Some people may experience mild reactions after vaccination, such as redness, swelling, pain, fever, headache, nausea, etc. The vaccine is contraindicated in people who are allergic to the vaccine, have an impaired immune system, or are pregnant, lactating or preparing for pregnancy. In addition, try to avoid having sex during the vaccination period. Take rest and avoid overwork.