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Abstract:

We tested experimentally the effects of the presence of non-susceptible hosts on the infection with Trypanosoma cruzi of the vector Triatoma infestans. The experiment consisted in two treatments: with chickens, including two chickens (non-susceptible hosts) and two infected guinea pigs (susceptible hosts), and without chickens, including only two infected guinea pigs. The hosts were held unrestrained in individual metal cages inside a closed tulle chamber. A total of 200 uninfected T. infestans third instar nymphs were liberated in each replica, collected on day 14, and examined for infection and blood meal sources on day 32-36. The additional presence of chickens relative to infected guinea pigs: (a) significantly modified the spatial distribution of bugs; (b) increased significantly the likelihoods of having a detectable blood meal on any host and molting to the next instar; (c) did not affect the bugs' probability of death by predation; and (d) decreased significantly the overall percentage of T. infestans infected with T. cruzi. The bugs collected from inside or close to the guinea pigs' cages showed a higher infection rate (71-88%) than those collected from the chickens' cages (22-32%). Mixed blood meals on chickens and guinea pigs were detected in 12-21% of bugs. Although the presence of chickens would decrease the overall percentage of infected bugs in short term experiments, the high rate of host change of T. infestans would make this difference fade out if longer exposure times had been provided.

Registro:

Documento: Artículo
Título:Effects of Non-Susceptible Hosts on the Infection with Trypanosoma cruzi of the Vector Triatoma infestans: An Experimental Model
Autor:Vázquez, D.P.; Canale, D.; Gürtler, R.E.
Filiación:Lab. de Ecología General, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Servicio Nacional de Chagas, 9 de julio 356, 5000 Córdoba, Argentina
Dept. of Ecol. and Evol. Biology, University of Tennessee, Knoxville, TN 37996-1610, United States
Palabras clave:Chagas disease; Host-feeding patterns; Infection; Transmission; Triatoma infestans; Triatominae; Trypanosoma cruzi; Zooprophylaxis; Cavia; Gallus gallus; Triatoma infestans; Triatominae; Trypanosoma; Trypanosoma cruzi; animal; article; Chagas disease; chicken; disease carrier; disease model; disease predisposition; disease transmission; feeding behavior; guinea pig; parasitology; pathogenicity; time; Triatoma; Trypanosoma cruzi; Animals; Chagas Disease; Chickens; Disease Models, Animal; Disease Susceptibility; Feeding Behavior; Guinea Pigs; Insect Vectors; Time Factors; Triatoma; Trypanosoma cruzi
Año:1999
Volumen:94
Número:3
Página de inicio:413
Página de fin:419
DOI: http://dx.doi.org/10.1590/S0074-02761999000300024
Título revista:Memorias do Instituto Oswaldo Cruz
Título revista abreviado:Mem. Inst. Oswaldo Cruz
ISSN:00740276
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00740276_v94_n3_p413_Vazquez

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Citas:

---------- APA ----------
Vázquez, D.P., Canale, D. & Gürtler, R.E. (1999) . Effects of Non-Susceptible Hosts on the Infection with Trypanosoma cruzi of the Vector Triatoma infestans: An Experimental Model. Memorias do Instituto Oswaldo Cruz, 94(3), 413-419.
http://dx.doi.org/10.1590/S0074-02761999000300024
---------- CHICAGO ----------
Vázquez, D.P., Canale, D., Gürtler, R.E. "Effects of Non-Susceptible Hosts on the Infection with Trypanosoma cruzi of the Vector Triatoma infestans: An Experimental Model" . Memorias do Instituto Oswaldo Cruz 94, no. 3 (1999) : 413-419.
http://dx.doi.org/10.1590/S0074-02761999000300024
---------- MLA ----------
Vázquez, D.P., Canale, D., Gürtler, R.E. "Effects of Non-Susceptible Hosts on the Infection with Trypanosoma cruzi of the Vector Triatoma infestans: An Experimental Model" . Memorias do Instituto Oswaldo Cruz, vol. 94, no. 3, 1999, pp. 413-419.
http://dx.doi.org/10.1590/S0074-02761999000300024
---------- VANCOUVER ----------
Vázquez, D.P., Canale, D., Gürtler, R.E. Effects of Non-Susceptible Hosts on the Infection with Trypanosoma cruzi of the Vector Triatoma infestans: An Experimental Model. Mem. Inst. Oswaldo Cruz. 1999;94(3):413-419.
http://dx.doi.org/10.1590/S0074-02761999000300024