9-valent and 4-valent generally refer to 9-valent HPV vaccine and 4-valent HPV vaccine. If you cannot get an appointment for 9-valent HPV vaccine, you can get 4-valent HPV vaccine because timely and effective defense against cervical cancer is the essence of vaccination. However, the 9-valent HPV vaccine is recommended when the subjective need or objective conditions are met for the 9-valent HPV vaccine, as it can defend against more subtypes of the virus. the age of vaccination for the 4-valent cervical cancer vaccine is 9-45 years old, and the age of vaccination for the 9-valent cervical cancer vaccine is 16-26 years old. When the age is between 16-26 years old and you are able to get the 9-valent HPV vaccine, try to get the 9-valent vaccine. When the age is about to exceed the age of 9-valent HPV vaccination and you cannot get an appointment for 9-valent HPV vaccine, you should get the 4-valent HPV vaccine in time and not keep waiting passively. If you unfortunately get infected with HPV virus while waiting, you will miss the best time to get the cervical cancer vaccine. 4-valent cervical cancer vaccine can effectively prevent four HPV subtypes: HPV type 6, 11, 16, and 18, which are 70% effective in preventing cervical cancer and 90% effective in preventing acromegaly. 9-valent cervical cancer vaccine can effectively prevent HPV types: HPV type 6, HPV type 11, HPV type 16, and HPV type 18. HPV11, HPV16, HPV18, HPV31, HPV33, HPV45, HPV52, HPV58 nine viruses, the effectiveness of preventing cervical cancer can reach 90%, the effectiveness of preventing acromegaly is also 90%, and it can also prevent vaginal cancer, anal cancer, low-grade cervical cancer, etc. Currently, there are three types of HPV vaccines that are clearly developed and proven to be effective and safe, namely the 2-valent cervical cancer vaccine, the 4-valent cervical cancer vaccine and the 9-valent cervical cancer vaccine. HPV is a group of more than 100 related viruses that are responsible for common warts and genital warts. HPV 16 and 18 are the most common types of HPV associated with cervical cancer worldwide. 2valent cervical cancer vaccine can effectively prevent these two types, so you should choose the vaccine according to your needs in time.