How long does HPV9 vaccine protect?

HPV9-valent vaccine has been on the market for a short time, and it is not clear how long the protection period is. Follow-up tests are needed to determine. However, HPV2-valent vaccine, HPV4-valent vaccine and HPV9-valent vaccine are all sterile vaccines. No matter how many vaccines are injected, the validity period of the vaccine is also different. The validity period is probably between 8 and 10 years. HPV vaccine can prevent 90% of cervical cancer and genital warts, and can also prevent 95% of anal cancer. HPV vaccine can not treat existing HPV infection, so HPV vaccine can not be immune for life. HPV vaccine still needs regular cervical cancer screening to prevent it before it occurs.