Importância dos animais sinantrópicos no controle da endemia chagásica

Silva, Eduardo Olavo da Rocha e; Andrade, José Carlos Rehder de; Lima, Anísio Ribeiro de

doi:10.1590/s0034-89101975000300010

Cited by 14 publications

(11 citation statements)

References 4 publications

(2 reference statements)

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“…Table 2 shows the experimental results in terms of the variables X, W, and Y. A contingency test using the ''biting'' and predation frequencies of Table 2 showed that the ''bit- Probability that a ''bite'' will infect an opossum p 2 Probability that a bug that has been eaten by an opossum will infect it, either because it had ''bitten'' the opossum previously, or as a direct result of having been ingested p 3 Probability that if a bug is ingested it will infect the opossum exclusively because of the ingestion itself p 4 Probability that an ingested bug might have ''bitten'' the opossum before being eaten p 5 Probability that, faced with a triatomine for 23 hr, the opossum will eat it p 6 Probability that, exposed for 23 hr to one infected triatomine, the opossum will become infected * For definition of a ''bite,'' see Materials and Methods. The experimental results showed that p 5 ϭ 0.254 (33 of 130 triatomines were eaten, see Table 2).…”

Section: Sources Of Datamentioning

confidence: 99%

“…The pЈ 4 and p 5 for encounter times between opossums and triatomines are as in the laboratory experiments, we replace in (A4-3) and (A4-4) T e by 23 hr:…”

Section: P(aј ͦ C) ϭ P(aј പ B ͦ C) ϩ P(aј പ Bј ͦ C) ϭ P(aј ͦ B പ C)p(mentioning

confidence: 99%

“…In all countries where the role of opossums as reservoirs of Trypanosoma cruzi has been studied, a relatively high prevalence of 20-100% was found. [1][2][3][4][5][6][7][8] In Argentina, Didelphis albiventris is the most important wild reservoir of T. cruzi, with an annual prevalence in Santiago del Estero that varied between 29% and 50% (Schweigmann N, unpublished data). This prevalence of this host coexists with a very low triatomine (particularly for Triatoma guasayana) infection, sometimes less than 1%.…”

Section: Introductionmentioning

confidence: 99%

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Probability of Trypanosoma cruzi transmission by Triatoma infestans (Hemiptera: Reduviidae) to the opossum Didelphis albiventris (Marsupialia: Didelphidae).

Rabinovich¹,

Schweigmann²,

Yohai³

et al. 2001

The American Journal of Tropical Medicine and Hygiene

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Abstract. The probability of Trypanosoma cruzi transmission to opossums by independent events of predation and fecal contamination during feeding (''biting'') with positive Triatoma infestans was estimated. Negative female opossums were challenged for 23 hr with 10 infected third and fourth instars of T. infestans, and tests for positivity for T. cruzi by xenodiagnosis were performed at 30, 60, and 90 days. From these data, seven probability parameters were estimated by maximum likelihood, and likelihood ratio statistics confidence intervals were calculated. Simultaneous estimation of p 1 (probability that a ''bite'' will infect an opossum), p 3 (probability that a bug that has been eaten by an opossum will infect it), and p 6 (probability that the opossum will become infected if faced with an infected triatomine), resulted in p 1 ϭ 0.06, p 3 ϭ 0.075, and p 6 ϭ 0.059. On average, each opossum should be exposed to an average of 700 encounters with bugs during its life, resulting in about eight potentially infective contacts, to produce the 35% opossum prevalence found in the field.

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Section: Sources Of Datamentioning

confidence: 99%

“…The pЈ 4 and p 5 for encounter times between opossums and triatomines are as in the laboratory experiments, we replace in (A4-3) and (A4-4) T e by 23 hr:…”

Section: P(aј ͦ C) ϭ P(aј പ B ͦ C) ϩ P(aј പ Bј ͦ C) ϭ P(aј ͦ B പ C)p(mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probability of Trypanosoma cruzi transmission by Triatoma infestans (Hemiptera: Reduviidae) to the opossum Didelphis albiventris (Marsupialia: Didelphidae).

Rabinovich¹,

Schweigmann²,

Yohai³

et al. 2001

The American Journal of Tropical Medicine and Hygiene

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show abstract

“…As observações levadas a efeito nessa região têm evidenciado a capacidade invasiva dessas populações em relação aos ecótopos artificiais. Ao lado disso, a sua apreciável positividade para a infecção natural, poderia traduzir-se em fator favorável à reinstalação do ciclo domiciliado da tripanossomíase (Rocha e Silva e col. 10 1975, Forattini e col. 2,3 1977). …”

Section: Comentáriosunclassified

“…Em regiões do Estado da Bahia, Brasil, onde este inseto constitui o único vetor nas habitações, temse assinalado o pequeno significado de cães, gatos e outros animais encontrados nesse ambiente. Por outro lado, na região meridional do território brasileiro na qual ocorre a presença das duas espécies, os mamíferos sinantrópicos, e representados principalmente por marsupiais e roedores, tendem a adquirir maior significado no mecanismo de transmissão mediado por esse triatomíneo (Rocha e Silva e col. 10 1975, Minter 6 1976).…”

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