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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
31/03/2012 |
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Data da última atualização: |
31/03/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PIRANDA, E. M.; FACCINI, J. L. H.; PINTER, A.; PACHECO, R. C.; CANCADO, P. H. D.; LABRUNA, M. B. |
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Afiliação: |
Eliane M. Piranda, Curso de Medicina Veterinaria, Escola Superior Batista do Amazonas (ESBAM); Joao Luiz H. Faccini, UFRRJ; Adriano Pinter, Superintendencia de Controle de Endemias, SUCEN, Sao Paulo; Richard C. Pacheco, UFMT; PAULO HENRIQUE DUARTE CANCADO, CNPGC; Marcelo B. Labruna, USP. |
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Título: |
Experimental infection of Rhipicephalus sanguineus ticks with the Bacterium Rickettsia rickettsii, using experimentally infected dogs. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Vector-Borne and Zoonotic Diseases, v.11, n.1, p.29-36, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
We evaluated if Rickettsia rickettsii-experimentally infected dogs could serve as amplifier hosts for Rhipicephalus sanguineus ticks. In addition, we checked if Rh. sanguineus ticks that acquired Ri. rickettsii from dogs could transmit the bacterium to susceptible hosts (vector competence), and if these ticks could maintain the bacterium by transstadial and transovarial transmissions. Uninfected larvae, nymphs, and adults of Rh. sanguineus were allowed to feed upon three groups of dogs: groups 1 (G1) and 2 (G2) composed of Ri. rickettsii-infected dogs, infected intraperitoneally and via tick bites, respectively, and group 3 composed of uninfected dogs. After larval and nymphal feeding on rickettsemic dogs, 7.1?15.2% and 35.8?37.9% of the molted nymphs and adults, respectively, were shown by polymerase chain reaction (PCR) to be infected by Ri. rickettsii, confirming that both G1 and G2 dogs were efficient sources of rickettsial infection (amplifier host), resulting in transstadial transmission of the agent. These infected nymphs and adults successfully transmitted Ri. rickettsii to guinea pigs, confirming vector competence after acquisition of the infection from rickettsemic dogs. Transovarial transmission of Ri. rickettsii was observed in engorged females that had been infected as nymphs by feeding on both G1 and G2 dogs, but not in engorged females that acquired the infection during adult feeding on these same dogs. In the first case, filial infection rates were generally <50%. No tick exposed to G3 dogs was infected by rickettsiae in this study. No substantial mortality difference was observed between Ri. rickettsii-infected tick groups (G1 and G2) and uninfected tick group (G3). Our results indicate that dogs can be amplifier hosts of Ri. rickettsii for Rh. sanguineus, although only a minority of immature ticks (<45%) should become infected. It appears that Rh. sanguineus, in the absence of horizontal transmission, would not maintain Ri. rickettsii through successive generations, possibly because of low filial infection rates. MenosWe evaluated if Rickettsia rickettsii-experimentally infected dogs could serve as amplifier hosts for Rhipicephalus sanguineus ticks. In addition, we checked if Rh. sanguineus ticks that acquired Ri. rickettsii from dogs could transmit the bacterium to susceptible hosts (vector competence), and if these ticks could maintain the bacterium by transstadial and transovarial transmissions. Uninfected larvae, nymphs, and adults of Rh. sanguineus were allowed to feed upon three groups of dogs: groups 1 (G1) and 2 (G2) composed of Ri. rickettsii-infected dogs, infected intraperitoneally and via tick bites, respectively, and group 3 composed of uninfected dogs. After larval and nymphal feeding on rickettsemic dogs, 7.1?15.2% and 35.8?37.9% of the molted nymphs and adults, respectively, were shown by polymerase chain reaction (PCR) to be infected by Ri. rickettsii, confirming that both G1 and G2 dogs were efficient sources of rickettsial infection (amplifier host), resulting in transstadial transmission of the agent. These infected nymphs and adults successfully transmitted Ri. rickettsii to guinea pigs, confirming vector competence after acquisition of the infection from rickettsemic dogs. Transovarial transmission of Ri. rickettsii was observed in engorged females that had been infected as nymphs by feeding on both G1 and G2 dogs, but not in engorged females that acquired the infection during adult feeding on these same dogs. In the first case, filial infection rates were generally ... Mostrar Tudo |
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Palavras-Chave: |
Bacterium Rickettsia rickettsii. |
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Thesagro: |
Carrapato; Sanidade Animal. |
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Thesaurus Nal: |
Rhipicephalus sanguineus. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02817naa a2200229 a 4500
001 1921280
005 2012-03-31
008 2011 bl uuuu u00u1 u #d
100 1 $aPIRANDA, E. M.
245 $aExperimental infection of Rhipicephalus sanguineus ticks with the Bacterium Rickettsia rickettsii, using experimentally infected dogs.$h[electronic resource]
260 $c2011
520 $aWe evaluated if Rickettsia rickettsii-experimentally infected dogs could serve as amplifier hosts for Rhipicephalus sanguineus ticks. In addition, we checked if Rh. sanguineus ticks that acquired Ri. rickettsii from dogs could transmit the bacterium to susceptible hosts (vector competence), and if these ticks could maintain the bacterium by transstadial and transovarial transmissions. Uninfected larvae, nymphs, and adults of Rh. sanguineus were allowed to feed upon three groups of dogs: groups 1 (G1) and 2 (G2) composed of Ri. rickettsii-infected dogs, infected intraperitoneally and via tick bites, respectively, and group 3 composed of uninfected dogs. After larval and nymphal feeding on rickettsemic dogs, 7.1?15.2% and 35.8?37.9% of the molted nymphs and adults, respectively, were shown by polymerase chain reaction (PCR) to be infected by Ri. rickettsii, confirming that both G1 and G2 dogs were efficient sources of rickettsial infection (amplifier host), resulting in transstadial transmission of the agent. These infected nymphs and adults successfully transmitted Ri. rickettsii to guinea pigs, confirming vector competence after acquisition of the infection from rickettsemic dogs. Transovarial transmission of Ri. rickettsii was observed in engorged females that had been infected as nymphs by feeding on both G1 and G2 dogs, but not in engorged females that acquired the infection during adult feeding on these same dogs. In the first case, filial infection rates were generally <50%. No tick exposed to G3 dogs was infected by rickettsiae in this study. No substantial mortality difference was observed between Ri. rickettsii-infected tick groups (G1 and G2) and uninfected tick group (G3). Our results indicate that dogs can be amplifier hosts of Ri. rickettsii for Rh. sanguineus, although only a minority of immature ticks (<45%) should become infected. It appears that Rh. sanguineus, in the absence of horizontal transmission, would not maintain Ri. rickettsii through successive generations, possibly because of low filial infection rates.
650 $aRhipicephalus sanguineus
650 $aCarrapato
650 $aSanidade Animal
653 $aBacterium Rickettsia rickettsii
700 1 $aFACCINI, J. L. H.
700 1 $aPINTER, A.
700 1 $aPACHECO, R. C.
700 1 $aCANCADO, P. H. D.
700 1 $aLABRUNA, M. B.
773 $tVector-Borne and Zoonotic Diseases$gv.11, n.1, p.29-36, 2011.
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Embrapa Gado de Corte (CNPGC) |
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| 24. |  | SINGH, R.; FERREIRA, W. de A.; TEIXEIRA NETO, J. F. Soil sampling for estimation of micronutrient availability and physico-chemical properties of a representative soil type of Marajo Island, Para. In: SIMPÓSIO DO TRÓPICO ÚMIDO, 1., 1984, Belém, PA. Resumos. Belém, PA: EMBRAPA-CPATU, 1984. p. 39-40. (EMBRAPA-CPATU. Documentos, 31).| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 25. | | SINGH, R.; FERREIRA, W. de A.; TEIXEIRA NETO, J. F. Soil sampling for estimation of micronutrient availability and physico-chemical properties of a representative soil type of Marajo Island, Pará. In: SIMPÓSIO DO TRÓPICO ÚMIDO, 1., 1984, Belém, PA. Anais. Belém, PA: EMBRAPA-CPATU, 1986. v. 1, p. 200-205. (EMBRAPA-CPATU. Documentos, 36). v.1 Clima e solo.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 30. | | VACARO, E.; BARBOSA NETO, J. F.; PEGORARO, D. G.; NUSS, C. N.; CONCEIÇÃO, L. D. H. Combining ability of twelve maize populations. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 1, p.67-72, jan. 2002 Título em português: Capacidade combinatória de doze populações de milho.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 34. | | FANTINI, A. C.; FEDERIZZI, L. C.; CARVALHO, F. I. F. de; BARBOSA NETO, J. F. Variabilidade genética e herança da estatura de planta em genótipos de trigo (Triticum aestivum L.). Pesquisa Agropecuária Brasileira, Brasília, DF, v. 29, n. 1, p. 123-131, 1994.| Biblioteca(s): Embrapa Trigo; Embrapa Unidades Centrais. |
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| 40. | | SILVA, A. R. da; DUTRA, S.; CAMARAO, A. P.; TEIXEIRA NETO, J. F. Consorciação de gramíneas e leguminosas em campos cerrados do Território do Amapá. In: REUNIÃO DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 15., 1978, Belém, PA. Anais. Belém, PA: SBZ, 1978. p. 394-395.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 220 | |
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