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Table 3 Prevalence of HPV types prevented by the Gardasil HPV vaccine and hypothetical vaccine protection against prevalent infectionsa

From: HPV infection among rural American Indian women and urban white women in South Dakota: an HPV prevalence study

  American Indian White
  (n= 235) (n= 246)
  % (95% CI) % (95% CI)
Infected by HPV types prevented by Gardasil vaccine     
   Type 6 1 (0-3) 1 (0-2)
   Type 11 1 (1-3) 0 --
   Type 16 5 (3-8) 6 (3-10)
   Type 18 5 (3-10) 1 (1-3)
Hypothetical protection a by Gardasil against prevalent HPV infection     
   Not applicable (no infection) 58 (51-65) 77 (71-82)
   No protection 32 (26-38) 15 (11-21)
   Partial protection 5 (3-8) 2 (1-4)
   Full protection 5 (3-10) 6 (3-10)
  1. Prevalence estimates are standardized by age and lifetime number of sexual partners.
  2. a Presumed protection against infection, assuming a counterfactual scenario in which each woman had been vaccinated before HPV exposure.