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Background  A large variety of mammals act as natural reservoirs of  Trypanosoma cruzi  (the causal agent of Chagas disease) across the American continent. Related issues are infection and parasite burden in these reservoirs, and whether they are able to control  T. cruzi  infections. These parameters can indicate the real role of mammals as  T. cruzi  reservoirs and transmitters. Here, two species of mammals, white-nosed coati ( Nasua narica ) and raccoon ( Procyon lotor ), were examined for to determine: a)  T. cruzi  presence, and; b) their ability to control  T. cruzi  infection.    Methods  Multiple capture-recaptures of both species were carried out in semi-wild conditions in Villahermosa, Tabasco, Mexico, for 5 years. Two samplings per year (summer and winter) took place. Prevalence and pattern of  T. cruzi  infection were determined by PCR from both mammals’ blood samples.    Results  Raccoon samples had a higher relative infection values (26.6%) compared to those of white-nosed coati (9.05%), being this difference significant in summer 2012 ( P  < 0.00001), summer ( P  = 0.03) and winter 2013 ( P  = 0.02). Capture and recapture data indicated three infection dynamics: 1) negative–positive-negative infection; 2) positive–negative-positive infection; and 3) positive at all sampling times.    Conclusions  These results indicate that both coati and raccoons may be able to control  T. cruzi  infection. Thus, the role as efficient reservoirs could be questioned (at least for those times when mammals are able to tolerate the infection). However, while infected, they may also be able to approach human dwellings and play a role important in linking sylvatic and domestic cycles.

parasites and vectors

Follow up of natural infection with Trypanosoma cruzi in two mammals species, Nasua narica and Procyon lotor (Carnivora: Procyonidae): evidence of infection control?