Final answer:
HPV types 6 and 11 cause about 90% of genital warts, while high-risk HPV types like 16 and 18 are associated with cervical cancer. Gardasil vaccine covers these strains to prevent the associated conditions.
Step-by-step explanation:
The types of Human Papillomavirus (HPV) mainly responsible for genital warts are HPV types 6 and 11. These two strains are considered low-risk HPV types, but they are highly transmissible and cause approximately 90% of all genital wart cases. Vaccines such as Gardasil include protection against these strains, as well as others associated with higher risks of cervical cancer, like types 16 and 18.