How much HPV vaccine do you need?

First, the so-called HPV price is its type, such as hepatitis A, hepatitis B, hepatitis C, is different types of hepatitis; second, high-risk type at least 13 types, there is no cross-immunity between the types, hit this type, there is no protection for other types, so the higher the price, the higher; third, 9 valence is better, because there are more types of protection.