What happens if you only get one gardasil shot and refuse the other two?

Partial protection: Because the research studies were done with 3 doses of Gardasil, it is not known how much antibody protection, and for how many years, a person would have with just one shot. There should be some protection. New studies are being done, especially for developing countries (due to the high cost of the vaccine), to see if just one or two doses are adequately protective.

Incomplete immunity: If you only get one of the three Gardasil injections, you will not be fully vaccinated and therefore not derive full benefit or protection. It is important to receive all three injections. They are given at 0, 2, and 6 months, respectively.