Volume 88, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A four-year longitudinal study of the structure of sylvatic transmission cycles of , reservoir host competence and parasite discrete typing units was conducted in a disturbed rural area of the humid Chaco in Argentina. Among 190 mammals examined by xenodiagnosis and polymerase chain reaction amplification, the composite prevalence of infection was substantially higher in armadillos (57.7%) and opossums (38.1%) than in (20.0%), (12.5%), and (6.3%) armadillos. was detected for the first time in small opossums and in two unidentified small rodents. Infection was spatially aggregated only in armadillos. All were infected with I and all armadillo species were infected with III, implying two distinct sylvatic cycles with no inputs from the domestic cycle. armadillos and opossums were much more infectious to vectors than other armadillos, small opossums, or rodents.


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  • Received : 24 Aug 2012
  • Accepted : 09 Dec 2012
  • Published online : 01 May 2013

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