In the absence of active blood donation screening, dengue viruses (DENV) have been implicated in only a limited number of transfusion transmissions worldwide. This study attempted to identify if blood from donors testing negative by an NS1-antigen (Ag) enzyme-linked immunosorbent assay (ELISA) but confirmed positive for DENV RNA caused DENV-related disease in recipients during the epidemic years of 2010 to 2012 in Puerto Rico.
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