“…1 Nucleic acid detection methods for HIV and hepatitis C (HCV) have reduced the window period for infectious risk, but may not eliminate transfusion-associated HIV 2 or HCV infections; 3 fatal bacterial infections caused by transfusion of platelet concentrates continue to be reported. 4 To improve the safety of platelet and plasma transfusion, a nucleic acid-targeted photochemical treatment (PCT) using the psoralen compound amotosalen HCl (S-59) and longwavelength ultraviolet A (UVA) light was developed to inactivate viruses, bacteria, and protozoa that may contaminate platelet and plasma components. 5,6 Preclinical studies have demonstrated inactivation of more than 10 6 infectious HIV particles, more than 10 5 infectious hepatitis B (HBV) and HCV particles, and a broad spectrum of gram-positive and gram-negative bacteria.…”