Geographical distribution of TrV prevalence in triatomines, and provinces of origin of the sera from Argentina. TrV was found in a region that covers nine provinces (colored in blue) . Red currency signs (¤) identify the four provinces where the 36 sera sample with three positive immunological reactions against TrV to TrV: Chaco (Ch), Santa Fe (SF), Santiago del Estero (SE) and Salta (S). The remaining provinces with negative sera for TrV (86) were Buenos Aires (BA), Jujuy (J), and Tucumán (T). Yellow Cyrillic Ef (ϕ) identifies provinces origin of sera analysed.