Whether screening is needed before taking the nine-valent vaccine is based on the age of the vaccinated person and whether she has had sex or not. 1. Screening is not required: women aged 16~26 years old who are using the vaccine, if there is no history of sexual intercourse before the injection, they will make an appointment for the injection directly and do not need to be screened. 2. Need to do screening: If you have already had sexual exposure, you need to do cervical cancer screening, including HPV and TCT, before injecting the nine-valent cervical cancer vaccine, to rule out the existence of HPV infection or cervical lesions. Nine-valent cervical cancer vaccine can effectively prevent cervical cancer or precancerous lesions caused by HPV infection, but the preventive effect of the vaccine is not 100%, even if you have already completed the three injections of the nine-valent cervical cancer vaccine, you still need to go to the hospital regularly for cervical cancer screening.