Detection of parasite-derived transrenal DNA for the diagnosis of chronic Trypanosoma cruzi infection

Chagas disease, caused by the protozoan parasite Trypanosoma cruzi, is a potentially life-threatening infection endemic to Latin America that has emerged as a global public health issue due to globalization and emigration patterns. Diagnosis of T. cruzi infection is complex, especially for the chronic phase of the disease that is characterized by a low to moderate burden of the difficult to detect, tissue-dwelling, intracellular form of the parasite. Diagnosis relies on a multistep indirect serological detection approach that requires positive results in at least two independent anti-T. cruzi antibody tests. With no gold standard diagnostic method for chronic T. cruzi, new approaches are needed that can more directly test for the presence of the parasite. Here, we report on of the potential utility of a noninvasive diagnostic approach that specifically detects T. cruzi-derived cell-free repeat DNA in the urine of patients who are both serologically positive and negative.

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