The fact that one immunocompromised patient with HCV contamination died from fulminant hepatitis after receiving a HAV-contaminated platelet transfusion underpins the importance of a HAV vaccination program for these group of patients. Keywords: Hepatitis A, Immunosuppression, Window period, Blood donor, Blood transfusion == Intro == Hepatitis A computer virus (HAV) is the most common agent causing acute liver disease, with approximately 1 . 4 million of new cases occurring every year worldwide [1]. implicated donation were HAV IgM-negative and IgG-positive. Qualitative PCR was positive on samples from all three individuals and phylogenetic analysis of viruses proved HAV transmission PRX933 hydrochloride to the two recipients of blood products. HAV viral weight on PRX933 hydrochloride donor follow-up sample and the platelet recipient was 1 . three or more and 1 . 5 103IU/ml, respectively. The RBC recipient, also infected by HCV, was undergoing bone marrow PRX933 hydrochloride transplantation and died from fulminant hepatitis, 26 days after the implicated HAV transfusion. == Bottom line == The blood donor, a garbage collector, spontaneously returned to the blood bank when developing jaundice. This highlights the importance of donor education to immediately report to blood banks of any signs and symptoms related to infectious disease developed after blood donation. The fact that one immunocompromised patient with HCV contamination died from fulminant hepatitis after receiving a HAV-contaminated platelet transfusion underpins the importance of a HAV vaccination program for these group of patients. Keywords: Hepatitis A, Immunosuppression, Window period, Blood donor, Blood transfusion == Intro == Hepatitis A computer virus (HAV) is the most common agent causing acute liver disease, with approximately 1 . 4 million of PRX933 hydrochloride new cases occurring every year worldwide [1]. In Brazil, two epidemiological scenarios with low and intermediate HAV endemicity are shown. The anti-HAV IgG seroprevalence varies from 33. 7% to 68. 8%, for the intermediate and low endemic areas [2]. HAV is a non-enveloped single-stranded RNA picornavirus from the genusHepatoviruswhose most common genotypes found in human infections are the genotypes I and III [1, 2, 3, 4]. Most cases of hepatitis A are self-limited and last 2-3 weeks after onset of symptoms [5]. Hepatitis A carries no risk for development of chronic hepatitis. The HAV incubation period usually lasts 2-7 weeks (average 28 days) prior to the onset of signs and symptoms. Viremia and fecal shedding often peak 2 weeks before symptoms appear. Laboratory findings are typical of hepatocellular injury with a noticeable elevated alanine aminotransferase (ALT) that precedes the elevation of serum NRAS bilirubin levels by a few days. When symptoms develop, PRX933 hydrochloride IgM is frequently detected and confirms cases of hepatitis A [1, 5]. Usually the main route of transmission is fecal-oral, through contaminated food and water [1, 5]. Because viremia develops before symptoms onset transfusion transmission by whole blood, fresh-frozen plasma, platelet concentrates, and red blood cells (RBCs) has been sporadically described since 1974 [6, 7, 8, 9]. However , in these reports it was difficult to demonstrate direct virological links between blood components and HAV infection. Using molecular methods, Gowland et al. [10] documented one case of HAV transmission by RBCs to a recipient that was anti-HAV IgG-positive. The recipient did not develop hepatitis A but viremia ensued 2 . 5 months later along with elevation of IgG titer. Sequencing of HAV RNA from both the donor’s and recipient’s samples verified the transfusion link between individuals. This article describes two cases of HAV transmission by blood transfusion from one infected donor. The two recipients were anti-HAV IgG-positive; nevertheless, both developed viremia, and one had elevated liver enzymes and symptoms characteristic of HAV infection. Molecular sequencing from the isolated HAV RNA from the three individuals confirmed the transfusion transmissions of HAV. == Material and Methods == == Ethics == This analysis was approved by the Ethics Committee from the National Cancer Institute, Rio de Janeiro, Brazil, under the registration number 100/13. == Blood Collection and Manufacturing == The donor’s whole blood was collected on CPDA-1 bag. RBCs and platelet-rich plasma were obtained after centrifugation of whole blood within 4 h of completion of the phlebotomy. The platelet concentrate was prepared by additional heavy-spin centrifugation, followed by removal of supernatant plasma. The platelet concentrate was stored under continuous turmoil at a temperature between 20.