Final answer:
The epithelial lining of the anogenital tract can be infected by several different types of HPV. Examples of oncogenic HPV types that can cause cancer include types 16 and 18.
Step-by-step explanation:
The epithelial lining of the anogenital tract can be infected by several different types of HPV. Researchers have identified over 200 different strains of HPV, with approximately 40 causing STIs. Some types of HPV cause genital warts, while others are associated with cervical cancers. Examples of oncogenic HPV types that can cause cancer include types 16 and 18.
There are vaccines available that can protect against certain types of HPV. The Gardasil vaccine includes types 6, 11, 16, and 18, while the Gardasil 9 vaccine includes the previous four types plus five additional high-risk types. Cervarix vaccine includes only HPV types 16 and 18. Vaccination is recommended for both boys and girls before sexual activity.