Even if you have already come into contact with the
virus,
vaccination can still be effective. Although HPV infection is common among sexually active women, most are not infected with all types covered by the vaccine, i.e. you could still become infected with another high-risk type of the HPV virus in the future. For example, if you had been infected with type 16 in the past, you could become infected with type 18 in the future.
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