Which of the following is not curable?

Of the eight common sexually transmitted infections, 4 are currently curable: syphilis, gonorrhoea, chlamydiasis and trichomoniasis. The other 4 are viral infections which are incurable: hepatitis B, herpes simplex virus (HSV or herpes), HIV, and human papillomavirus (HPV). Symptoms or disease due to the incurable viral infections can be reduced or modified through treatment.