In a study carried out at the same blood bank in the period ranging from January 2003 to December 2012, of the total number of donations, the serological testing with the highest positivity was anti-HBc (2.7% of discards), HIV (0.9%), hepatitis C (0.8%), HBsAg (0.3%), and HTLV (0.2%)21. The gene discussed is KRT88P; the disease is hepatitis C virus infection.