There are more than 100 human papillomavirus genotypes. Approximately 40% of them are sexually transmitted.
We often speak of types 16 and 18 because they account for almost three quarters of HPV-related cancers. These two types are responsible for close to 70% of cervical cancers, 90% of vaginal and anal cancers and 40% of cancers of the vulva and penis. We call these “high risk HPV types.”
There are also often issues regarding types 6 and 11 that are “low risk HPV types.” They are responsible for almost all genital and anal warts but also some lesions in the anogenital area.
It is possible to be infected by more than one type of HPV at the same time. You can also be infected more than once in your life.