==Effectiveness==
The HPV vaccine is being promoted as protection against cervical cancer, but Merck itself does not ensure protection in its package insert.<ref>http://www.merck.com/product/usa/pi_circulars/g/gardasil/gardasil_pi.pdf</ref> Rather, this claim is based on research showing that 70% of cervical cancer cases also have prevalence of these four strains of HPV, but correlation is not necessarily causation.<ref>http://www.cancer.gov/cancertopics/factsheet/Risk/HPV</ref> Cervical cancer has already been quickly declining in the United States ''without'' the vaccine.
Merck sells Gardasil for $360 ($120 per shot in a three-shot series). Adding administrative costs, the overall cost to the public is $400-500 per child vaccinated. Doing the math, the cost of vaccinating 100 children will be at least $40,000, but only 3 out of that 100 will ever be exposed to the HPV types targeted by the vaccine.<ref name="JAMA" />