<prompt> Screening for following viral infections in blood donor is compulsory:HIVHBVHCVAll of these  <response>: 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. 