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A seminested PCR assay was developed in order to amplify the kinetoplast minicircle ofLeishmania species from individual sand flies. The kinetoplast minicircle is an ideal target because it is present in 10,000 copies per cell and its sequence is known for mostLeishmania species. The two-step PCR is carried out in a single tube using three primers, which were designed within the conserved area of the minicircle and contain conserved sequence blocks. The assay was able to detect as few as 3 parasites per individual sand fly and to amplify minicircle DNA from at least eightLeishmania species. This technique permits the processing of a large number of samples synchronously, as required for epidemiological studies, in order to study infection rates in sand fly populations and to identify potential insect vectors. Comparison of the sequences obtained from sand flies and mammal hosts will be crucial for developing hypotheses about the transmission cycles ofLeishmania spp. in areas of endemicity.

Detection and Identification of Leishmania DNA within Naturally Infected Sand Flies by Seminested PCR on Minicircle Kinetoplastic DNA