The bivalent vaccine: only protects against the two high risk HPV subtypes. Not against the lower risk wart subtypes. The immunity so far holds for as many as 20 years or more, in some test panels. Quadravalent vaccine 2 high risk and 2 low risk subtypes. Polyvalent cover 7 high risk and 2 low risk subtypes
Answered 3/17/2020
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