Hepatitis C (HCV) primarily causes a long-lasting liver disease. It is spread by contact with infected blood.

HIV-1 is the most common subtype of the lentivirus HIV which infects T helper cells of the immune system.

HIV-1 is the most common subtype of the lentivirus HIV which infects T helper cells of the immune system.

HIV type 2 is a sub species of the lentivirus HIV. HIV-2 has a slower progression rate of the disease, as well as lower rates of transmission compared to HIV-1.

Human HIV-2 PB：HIV type 2 is a sub species of the lentivirus HIV. HIV-2 has a slower progression rate of the disease, as well as lower rates of transmission compared to HIV-1.