What retroviruses are currently known as carcinogens?

The retroviruses currently known as carcinogens include:

- Human T-lymphotropic virus type 1 (HTLV-1)

- Human T-lymphotropic virus type 2 (HTLV-2)

- Human immunodeficiency virus type 1 (HIV-1)

- Epstein-Barr virus (EBV)

- Kaposi's sarcoma-associated herpesvirus (KSHV)

- Human papillomavirus (HPV)

- Hepatitis B virus (HBV)

- Hepatitis C virus (HCV)