It takes three shots of the nine-pronged one to get it. The HPV 9-valent vaccine is used to prevent human papillomavirus (HPV) infections, and a total of three doses are required, in months 0, 2, and 4. The HPV vaccine is administered by inoculating the body with inactivated human papillomavirus, which causes the body to develop immunity against HPV, thus producing protective antibodies. This principle is actually the same as other vaccines such as the flu vaccine and hepatitis B vaccine. After vaccination, there may be fever, pain, redness and swelling at the injection site, etc. Most of the reactions are mild and generally do not require special treatment and can be relieved on their own, if necessary, they should contact the vaccination unit in time and go to the local hospital for consultation.