What is the difference between bivalent, quadrivalent and nivalent cervical cancer vaccines?

The difference between bivalent, quadrivalent and nine-valent cervical cancer vaccine is the type of virus to be prevented, applicable age, injection time, etc.
1. Bivalent cervical cancer vaccine: the vaccine can prevent HPV (human papillomavirus) type 16 and HPV type 18 two high-risk subtypes of viruses, mainly used for women aged 9 to 45 years old, the injection time is the 0th, 1, June for injection.
2. Quadrivalent Cervical Cancer Vaccine:Quadrivalent cervical cancer vaccine can not only prevent the two high-risk subtypes of HPV16 and HPV18, but also prevent the two low-risk subtypes that cause warts, which are HPV6 and HPV11. The vaccine is also used for women between the ages of 9 and 45, and the injections are given at the 0th, 2nd, and 6th month.
3. Nine-valent cervical cancer vaccine: In addition to preventing HPV16, HPV18, HPV6 and HPV11, the vaccine also prevents HPV31, HPV33, HPV45, HPV52 and HPV58, which is the most comprehensive cervical cancer vaccine for preventing HPV, and is used for females aged 16 to 26 years old, and the injection time is the same as that for the four-valent cervical cancer vaccine. The injection schedule is consistent with the quadrivalent cervical cancer vaccine.