Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Infection Genetics and Evolution 457-462 Trypanosoma genus Trypanosoma evansi Trypanosoma cruzi antigenic cross reaction serodiagnosis ELISA phylogeny 2007 fdi:010040679 ENG Infection Genetics and Evolution 1567-1348 CC:0002477332-0007 4 10.1016/j.meegid.2007.01.007 https://www.documentation.ird.fr/hor/fdi:010040679 https://www.documentation.ird.fr/intranet/publi/2007/09/010040679.pdf 7 Horizon (IRD) Antigenic similarities between salivarian trypanosomes are known for a long time, but similarities between salivarian and stercorarian trypanosomes have been very little investigated. Phylogenetically, these genus and species appear to be far. However, in a preliminary work we had shown strong reactions of chagasic human sera using T evansi antigens in Western-blotting and ELISA. In the current work an ELISA test using T evansi crude antigens was probed with one hundred and two sera of chagasic Bolivian patients previously diagnosed which presented different pathologies. The sensitivity of the ELISA T evansi was 92.6% similar to that of ELISA T cruzi. The specificity evaluated using 20 sera of patients infected by Leishmania sp. reaches a comparable value of that obtained with the T cruzi immunofluorescent in in unotl uore scent assay. Finally, the sensitivity and the specificity of the ELISA T evansi were not really different from conventional serology of Chagas. In spite of their taxonomic position in various sections and their old divergence, these observations prove a strong antigenic community between T cruzi and T evansi. Consequently, the common antigens which remain to be characterized, could be an alternative source of antigen for the detection of antibodies against T cruzi. Given that T evansi seems to have strong antigenic communities with the majority of the pathogenic current trypanosomoses f mammals, it is very attractive to identify and characterize these highly conserved antigens which could be suitable targets to develop tools for diagnosis, prophylaxy and chemotherapy against several human and animal trypanosomoses. 052