RESUMEN
PURPOSE: Trypanosoma cruzi and Leishmania spp. coexist in several endemic areas, and there are few studies of Chagas disease and leishmaniasis coinfection worldwide; for this reason, the objective of this work was to determine the Chagas disease and leishmaniasis coinfection in several rural communities co-endemic for these diseases. METHODS: A total of 1107 human samples from six co-endemic rural communities of Cojedes state, Venezuela, were analyzed. Serum samples were evaluated by ELISA, indirect hemagglutination, and indirect immunofluorescence for Chagas disease diagnosis, and individuals were evaluated for leishmaniasis by leishmanin skin test (LST). Approximately, 30% of the individuals were also analyzed by PCR (blood clot samples) for T. cruzi and for Leishmania spp. RESULTS: The 14.7% of the individuals were positive to Trypanosoma cruzi infection by serology, and 25.8% were positive to Leishmania spp. current or past infection by LST. Among the group with PCR results, 7.8% were positive for T. cruzi, and 9.4% for Leishmania spp. The coinfection T. cruzi/Leishmania spp. was 6.5%. The T. cruzi DTUs of the positive blood clot samples were TcI, revealed using the molecular markers: (i) intergenic region of the miniexon, (ii) D7 divergent domain of the 24Sα rDNA, (iii) size-variable domain of the 18S rDNA, and (iv) hsp60-PCR-RFLP (EcoRV). The Leishmania species identified were L. (Leishmania) mexicana and L. (Viannia) braziliensis. CONCLUSION: A high prevalence was found for T. cruzi and Leishmania spp. single and coinfections in almost all communities studied, being these results of relevance for the implementation of control programs in co-endemic areas.
RESUMEN
American trypanosomiasis and leishmaniases are diseases caused by protozoans of the Trypanosomatidae family. In Venezuela, although several endemic foci of both diseases coincide, there are no reports of coinfection in mammals. The molecular diagnosis of the coinfection T. cruzi-Leishmania spp. was done in 527 blood samples collected on filter paper of several species of mammals (Canis familiaris, Equus asinus, Didelphis marsupialis, Equus mulus, Rattus rattus, Equus caballus, Artibeus fraterculus, Felis catus, Sus scrofa, Bos taurus, Capra hircus and Sciurus granatensis) from the states Cojedes, Aragua, Anzoátegui, Guárico, Miranda and Capital District. The T. cruzi infection was determined through PCR amplification of DNA of kinetoplast minicircles (kDNA) and satellite DNA (sDNA). The Leishmania spp. infection was detected by Leishmania nested PCR (Ln-PCR), and ribosomal DNA internal transcribed spacer 1 PCR (ITS1-PCR). The percentage of infection by T. cruzi was 23.5%, by Leishmania spp. 12.9% and coinfection was 5.7%. D. marsupialis was the species with the highest percentage of infection for each parasitosis (T. cruzi 34.3%, Leishmania spp. 20.0%) and coinfection (14.3%). Anzoátegui was the state with the highest percentage of infection for each parasitosis (T. cruzi 64.9%, Leishmania spp. 64.9%) and coinfection (43.2%). Infections were determined in species not reported as natural reservoirs of T. cruzi (E. asinus and E. mulus) and of Leishmania spp. (E. mulus and S. scrofa). Coinfection was a frequent phenomenon in mammals in several co-endemic zones evaluated.
