Considering that human papillomavirus can be repeatedly infected, it is generally considered that there is no need to test whether there is human papillomavirus infection in the body before vaccination. However, if you have been infected with human papillomavirus or caused cervical lesions, it is another matter, and it is better to vaccinate after treatment turns negative.
Screening is needed after vaccination. Regardless of bivalent vaccine, tetravalent vaccine and nonavalent vaccine, regular screening is still needed after vaccination. There is a simple reason. Existing vaccines, including the nine-valent vaccine, cannot prevent all high-risk human papillomavirus. There may still be a small wave of high-risk human papillomavirus, which has not yet been determined, and of course there is no targeted vaccine.
Refer to the above content: Baidu Encyclopedia-Nine-valent HPV Vaccine