Screening for following viral infections in blood donor is compulsory:
Screening of all blood donations should be mandatory for the following infections and using the following markers:

HIV-1 and HIV-2: Screening for either a combination of HIV antigen-antibody or HIV antibodies.
Hepatitis B: Screening for hepatitis B surface antigen (HBsAg).
Hepatitis C: Screening for either a combination of HCV antigen-antibody or HCV antibodies.
Syphilis (Treponema pallidum): Screening for specific treponemal antibodies.
HIV
HBV
HCV
All of these