Genetic factors and the immunologic response have been suggested to determine the susceptibility against the infection and the outcome of chagas disease. in the present study, we analysed three IL17A genetic variants (rs4711998, rs8193036 and rs2275913) regarding the predisposition to Trypanosoma cruzi infection and the development of chronic Chagas cardiomyopathy (CCC) in different Latin American populations. A total of 2,967 individuals from Colombia, Argentina, Bolivia and Brazil, were included in this study. The individuals were classified as seronegative and seropositive for T. cruzi antigens, and this last group were divided into asymptomatic and ccc. for T. cruzi infection susceptibility, the IL17A rs2275913*A showed a significant association in a fixed-effect meta-analysis after a Bonferroni correction (p = 0.016, OR = 1.21, 95%CI = 1.06-1.41). No evidence of association was detected when comparing ccc vs. asymptomatic patients. However, when ccc were compared with seronegative individuals, it showed a nominal association in the meta-analysis (p = 0.040, oR = 1.20, 95%CI = 1.01-1.45). For the IL17A rs4711998 and rs8193036, no association was observed. in conclusion, our results suggest that IL17A rs2275913 plays an important role in the susceptibility to T. cruzi infection and could also be implicated in the development of chronic cardiomyopathy in the studied Latin American population.Chagas disease caused by the protozoan Trypanosoma cruzi is a parasitic infection endemic in Latin American countries, which is nowadays increasingly becoming a global health problem, due to migration to non-endemic areas 1,2 . Around 6 to 7 million people are estimated to be infected worldwide, mostly in Latin America 1,3 . During the acute phase of the disease, the increase of parasitic load induces an inflammatory process for the control of the pathogen 4 . Ten to thirty years after infection, around 30 to 40% of chronically infected patients can develop cardiomyopathy or/and megaviscera. The symptoms include cardiac conduction abnormalities, myocardial contractile dysfunction, arrhythmias, dysphagia, regurgitation, and severe constipation, among others. The cardiac involvement is the most frequent manifestation of the disease 5,6 . The characteristics of this phase vary in different patients and in different regions of the endemic area 7 .After the infection with T. cruzi, interleukin-17A (IL-17A) is produced by T helper 17 (Th17) cells, subset of CD4+ T cells, and innate lymphoid cells 8,9 . More recently, it has been described that B cells are also an important source of IL-17A and IL-17F, produced as well after T. cruzi infection 10,11 . In response to the infection, IL17-A, induces a rapid proinflammatory cascade of chemokines and cytokines that facilitates the recruitment and activation of neutrophils and monocytes required for the early control of the pathogen by the immune system 12,13 . In the chronic phase of the disease, several studies suggest that the clinical progression of Chagas cardiomyopathy involves th...