HPV Vaccine: One Dose May Be Enough

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http://www.livescience.com/40909-hpv-vaccine-one-dose.html

A single dose of the human papillomavirus (HPV) vaccine may be enough to protect women against infection with the virus over the long-term, a new study from Costa Rica suggests.

In the study, women who received one, two, or the standard three doses of the HPV vaccine all produced antibodies against the virus that remained at stable levels in their bodies for four years after vaccination.

In addition, women who received one dose of the vaccine had an immune response that was five to nine times stronger than that seen in women who were infected with HPV naturally. [5 Dangerous Vaccination Myths]

However, women who received only one vaccine dose produced antibodies at levels lower than those of women given two or three doses. Still, researchers don't yet know what level would be "good enough" for protection. It could be that the immune response generated after two or three doses is much more than a person needs to be protected.