Nine-valent vaccine is known as the nine-valent human papillomavirus vaccine, and the preventive vaccination is applicable to the age of 16-26 years old. Nine-valent vaccine is a cervical cancer vaccine that prevents the most types of HPV viral infections on the market at present, and helps prevent cervical cancer lesions caused by persistent infection with high-risk HPV viruses, as well as preventing infections of the reproductive system, such as condyloma acuminatum, perianal tumors viruses and so on. Therefore, China actively encourages women to receive the nine-valent vaccine within the appropriate age. China’s vaccination of the nine-valent vaccine stipulates that the age is 16-26 years old, mainly because of the consideration that women are not easy to be infected with the HPV virus when they have no sexual experience, while most of the women over the age of 26 years old have already had a history of sexual contact, and there exists the possibility of being infected with the HPV virus, so the age of the vaccination is usually restricted. For women of the right age, try to get the nine-valent vaccine before you are sexually inactive. The vaccination is usually completed within six months of three shots, theoretically speaking, after the first shot the body can produce antibodies, and after the third shot the antibodies will remain at a relatively stable level, the earlier the shot the earlier the production of antibodies.