I found a journal on BMJ which show increase of cervical cancer risk on female in whom the HPV persists for several months. Researcher show that women who have persist HPV infection are have a higher risk than who quickly clear the infection. This study is important for cervical cancer prevention, and for research into a vaccine against HPV.
Immediately after the onset of sexual activity, rates of HPV are very high as women become infected. In most women, the immune system will quickly clear the infection, but in a immunedefficience-women the HPV infection persists.
Latest cervical cancer study found that women were more likely to show cervical abnormalities called squamous intraepithelial lesions or cervical intraepithelial neoplasia, which sometimes become cervical cancer, when their infection persisted over several months (JAMA 2001;286:3106-14). From that study we can surely make a conclusion that HPV infection is cervical cancer risk factor which must be prevented.