About thirty types of HPV are transmitted by genital contact. They are each “baptized” with a number, in the order they were discovered. Moreover, they are divided into two groups :
« Low Risk » HPV Types
Nearly 12 types of HPV are called “low risk” because they cannot cause cancer of the cervix. They can, however, cause warts or minute cell changes in the cervix. Types 6 and 11, which are related to approximately 90% of warts or genital warts, are the most common.
« High Risk » HPV Types
There are more than a dozen “high risk” HPV types that can cause abnormal cells to form on the cervix. These abnormal cell changes may gradually progress to cervical cancer if they are not removed.
The 13 highest risk HPV types are 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59 and 68.
Types 16 and 18 are the most dangerous because they are responsible for about 70% of cervical cancers. In one study, the American National Cancer Institute found that about 10% of women with HPV type 16 or 18 developed advanced precancerous cervical disease within three years (compared with only 4% of women carriers). of any type of HPV) and 20% did the same in the 10 years (against 7%).