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[Update on infectious risks associated with blood products].

La Revue du Praticien 2009 January 21
Many infectious diseases are transmissible by blood transfusion but the overall risk of transfusion transmitted infections is very low through the combination of restrictive donor selection and increasingly sensitive screening. The noninfectious risks (hemolytic transfusion reactions, circulatory overload, transfusion related lung injury) are higher than the current infectious risks. Bacterial contamination of blood components remains the most frequent infectious risk from transfusion but are constantly declining. The estimated residual risk for transfusion transmitted HIV and hepatitis are lower 1/2 600 000 for HIV, 1/6 500 000 for HCV, 1/1 700 000 for HBV. For the future, the concerns are the risks of emerging or reemerging infections transmitted by blood as dengue, Chickungunya, West Nile Virus... Four transfusion transmissions of vCJD have been reported in UK, uncertainties about the incubation periods, the number of infected donors and the lack of sensitive assays for screening blood aggravate concerns about the transfusion transmission risks for vCJD. The ultimate strategy against infectious disease (all but vCJD) could be to develop inactivation methods. Pathogen inactivation have been implemented for plasma, are expected to become available for platelets, but for red blood cells are only in development.

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