Trypanosoma cruzi infection in Didelphis marsupialis in Santa Catarina and Arvoredo Islands, southern Brazil

Grisard, Edmundo Carlos; Carvalho-Pinto, Carlos José de; Scholz, Afonso F; Toma, Helena Keiko; Schlemper, Bruno Rodolfo; Steindel, Mário

doi:10.1590/s0074-02762000000600008

Cited by 24 publications

(20 citation statements)

References 20 publications

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“…and Rhodnius sp. 38,39 An unexpected result was the absence of a stage-related increase in the prevalence of infection (produced by cumulative exposure) in white-eared opossums that did not fit a nonreversible catalytic model, in contrast to previous studies of opossums and dogs. 19,28 The decrease in infections recorded in adult opossums may not be explained by an age-related decrease in infectiousness because we also used a more sensitive detection method (kDNA-PCR).…”

Section: Discussionmentioning

confidence: 82%

New Sylvatic Hosts of Trypanosoma cruzi and Their Reservoir Competence in the Humid Chaco of Argentina: A Longitudinal Study

Orozco¹,

Enriquez²,

Alvarado-Otegui³

et al. 2013

The American Journal of Tropical Medicine and Hygiene

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Abstract.A four-year longitudinal study of the structure of sylvatic transmission cycles of Trypanosoma cruzi, 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 Dasypus novemcinctus armadillos (57.7%) and Didelphis albiventris opossums (38.1%) than in Euphractus sexcinctus (20.0%), Tolypeutes matacus (12.5%), and Chaetophractus vellerosus (6.3%) armadillos. Trypanosoma cruzi was detected for the first time in Thylamys pusilla small opossums and in two unidentified small rodents. Infection was spatially aggregated only in armadillos. All Didelphis were infected with T. cruzi I and all armadillo species were infected with T. cruzi III, implying two distinct sylvatic cycles with no inputs from the domestic cycle. Dasypus armadillos and Didelphis opossums were much more infectious to vectors than other armadillos, small opossums, or rodents.

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Section: Discussionmentioning

confidence: 82%

New Sylvatic Hosts of Trypanosoma cruzi and Their Reservoir Competence in the Humid Chaco of Argentina: A Longitudinal Study

Orozco¹,

Enriquez²,

Alvarado-Otegui³

et al. 2013

The American Journal of Tropical Medicine and Hygiene

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“…An extensive xenodiagnosis survey of four species of armadillos also gave negative results for T. cruzi in three provinces in northeastern Argentina (Martínez et al, 1983), unlike hemoculture surveys in the Paraguayan Chaco (Yeo et al, 2005). Interestingly, high infection prevalences in Didelphis opossums (36%) were also recorded in the neighboring Chaco province between 1999 and 2002 (Diosque et al, 2004), and were as high as 52% elsewhere in the Americas (Grisard et al, 2000;Telford and Tonn, 1982;Travi et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Long-term reduction of Trypanosoma cruzi infection in sylvatic mammals following deforestation and sustained vector surveillance in northwestern Argentina

et al. 2006

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Long-term variations in the dynamics and intensity of sylvatic transmission of Trypanosoma cruzi were investigated around eight rural villages in the semiarid Argentine Chaco in 2002-2004 and compared to data collected locally in 1984-1991. Of 501 wild mammals from 13 identified species examined by xenodiagnosis, only 3 (7.9%) of 38 Didelphis albiventris opossums and 1 (1.1%) of 91 Conepatus chinga skunks were infected by T. cruzi. The period prevalence in opossums was fourfold lower in 2002-2004 than in 1984-1991 (32-36%). The infection prevalence of skunks also decreased five-fold from 4. 1-5.6% in 1984-1991 to 1.1% in 2002-2004. Infection in opossums increased with age and from summer to spring in both study periods. The force of infection per 100 opossum-months after weaning declined more than six-fold from 8. . The striking decline of T. cruzi infection in opossums and skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks. These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.

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“…The search for triatomines in the palm clefts revealed T. tibiamaculata that harbored the Tr. cruzi forms in their guts 45 . It was assumed that the triatomines with Tr.…”

Section: Emerging Chagas Diseasementioning

confidence: 99%

Environment, interactions between Trypanosoma cruzi and its host, and health

et al. 2009

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Trypanosoma cruzi infection in Didelphis marsupialis in Santa Catarina and Arvoredo Islands, southern Brazil

Cited by 24 publications

References 20 publications

New Sylvatic Hosts of Trypanosoma cruzi and Their Reservoir Competence in the Humid Chaco of Argentina: A Longitudinal Study

New Sylvatic Hosts of Trypanosoma cruzi and Their Reservoir Competence in the Humid Chaco of Argentina: A Longitudinal Study

Long-term reduction of Trypanosoma cruzi infection in sylvatic mammals following deforestation and sustained vector surveillance in northwestern Argentina

Environment, interactions between Trypanosoma cruzi and its host, and health

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