“…The wide range of reported TRALI incidence rates (5,17,18,23) can be attributed to different definitions used in studies or surveillance systems, different diagnostic criteria, different quality of denominator data used (eg, components issued versus products transfused) and, most importantly, whether the rates were derived from prospective studies or from surveillance systems; in the latter case, the rates vary according to the characteristics of the surveillance system. Between 1996 and 2005, the Serious Hazards of Transfusion (SHOT) hemovigilance system has analysed 3239 reports of adverse reactions and events associated with transfusion in the United Kingdom (25).…”