is hpv transmitted through sex
High-Risk HPV, Low-Risk HPV. Not all of the 40 sexually transmitted HPV viruses cause serious health problems. High-risk HPV strains include HPV 16 and 18, which cause about 70% of cervical cancers. Other high-risk HPV viruses include 31, 35, 39, 45, 51, 52, 58, and a few others.