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Primer hallazgo de vectores de la enfermedad de Chagas asociados a matorrales silvestres en la Región Metropolitana, Chile
Bacigalupo B,Antonella; Segura M,José A; García C,Alejandro; Hidalgo C,Javier; Galuppo G,Stephania; Cattan,Pedro E;
Revista médica de Chile , 2006, DOI: 10.4067/S0034-98872006001000003
Abstract: background: insects of the subfamily triatominae are the biological vectors of trypanosoma cruzi, the causal agent of chagas disease. aim: to search for wild colonies of triatomines in the metropolitan region of chile. material and methods: ad hoc traps were placed in two endemic zones of the metropolitan region of chile, during 30 nights. the dejections of 16 t infestans and 43 m spinolai specimens were examined under the microscope, searching for live metacyclic trypomastigotes. a polymerase chain reaction (pcr) was performed in macerates of all insects looking for t cruzi dna. results: a total of 269 bugs were captured. forty four were triatoma infestans and 225 were mepraia spinolai. they were not syntopic, since t infestans was restricted to a southern zone (calera de tango) while m spinolai was only found in the northern zone (til-til). both species were found associated to terrestrial bromeliads (puya sp) but m spinolai was also detected in stony grounds. microscopic examination of dejections yielded a trypano-triatomine index of 56.3 and 32.6 for t infestans and m spinolai, respectively. pcr detected t cruzi dna in 41 and 43% of t infestans and m spinolai specimens, respectively. conclusions: the finding of t infestans in a wild habitat is noticeable. this is the first report of such phenomenon in chile. the high infection rates with t cruzi, explains the maintenance of chagas disease wild cycle in chile
Relevamiento de vectores de la Enfermedad de Chagas en peridomicilios del área rural del Departamento Ayacucho, San Luis, Argentina
Chartier,Diego I.; Crocco,Liliana B.;
Revista de la Sociedad Entomol?3gica Argentina , 2007,
Abstract: due to the importance of peridomestic populations in the reinfestation process of the domicile, the aim of this work was to evaluate the presence of triatomines in peridomiciles located in the san francisco del monte de oro community, ayacucho dept., argentina. the presence of triatomines was evaluated in 18 peridomiciles between the months of october to march (2003/2004). the type of construction, host and number of triatomines were recorded for each peridomestic annex. the captured triatomines were taxonomically classified and their infectivity recorded. the 98.3 % of the triatomines corresponded to the species triatoma infestans (klug). the 79.3 % of the evaluated annex were found positive. the infestation indexes for goat corrals and chicken coops were 94.4 % and 54.5 %, respectively. there were no insects infected with trypanosoma cruzi (chagas). the corrals were differentiated in: stone pile, palisade and wood pile. stone pile corrals showed larger number of triatomines than the palisade corrals (p< 0,05) stone pile corrals seem to offer an adequate shelter for triatomines, probably due to the high number of empty spaces that offer and a higher difficulty for chemical control.
Comparación de métodos de captura intradoméstica de triatominos vectores de la enfermedad de Chagas en Venezuela
Feliciangeli,M. Dora; Hernández,Mayeli; Suarez,Benny; Martínez,Cinda; Bravo,Arturo; Bracho,José; Toyo,José; Torrellas,Annhymariet; Marrero,Rosalba;
Boletín de Malariología y Salud Ambiental , 2007,
Abstract: among the epidemiological surveillance activities, risk stratification is needed in order to establish priorities in the chagas disease control program for the purpose of resource optimization. it is therefore necessary to rely on a method of high sensitivity for the detection of domestic infestation by triatomine vectors, mainly in situations of low density. in this study the results obtained with 5 capture methods were compared, 2 of passive search: gomez-nu?ez boxes and a4 bond paper located on the walls of the bedrooms, 2 methods of active search carried out by trained personnel: direct capture without and direct search with the aid of a flushing agent (cypermethrin + tetrametrhrin) and the collection of live triatomine vectors by the inhabitants, during 1 month. the study was carried out in 11 localities and 200 houses of portuguesa state and in 29 localities and 350 houses in barinas state. results obtained with the different methods were not significantly different in the 2 states. of the total of 550 houses explored, 132 were positive, in 131 (99.2%) the presence of bugs was detected by the inhabitants vs. 5.3% by active search: 3.38% by gomez-nu?ez boxes; 3.03% by flushing out search and 0% by paper. five species and 563 individuals were collected: rhodnius prolixus was the predominant species, followed by triatoma maculata, panstrongylus geniculatus and r. pictipes. the epidemiological indices of dispersion, colonization and infection to trypanosoma cruzi were calculated for each locality. results support the hypothesis of a new epidemiological scenario where, in the localities in which the domestic cycle has been interrupted, the transmission is primarily maintained by visiting r. prolixus coming in from nearby palms. the unequivocal importance of community participation in the epidemiological surveillance in the control program of chagas disease in venezuela is pointed out.
Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Descripción de la Genitalia Externa del Macho y Morfología Externa de la Hembra Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Description of the External Male Genitalia and External Morphology of the Female  [cached]
Paz María Salazar Schettino,Gloria Elena Rojas Wastavino,José Santiago Rosales Pi?a,Mauro Omar Vences Blanco
EntomoBrasilis , 2013, DOI: 10.12741/ebrasilis.v6i1.275
Abstract: Triatoma mexicana fue descrita originalmente en 1848 por Herrich-Schaeffer nombrándola Conorhinus mexicanus Herrich-Schaeffer. Actualmente se registra su hallazgo en los estados de Guanajuato, Hidalgo Querétaro y San Luis Potosí. Los estudios sobre su distribución espacial, índices entomológicos, presencia en el intradomicilio y peridomicilio, biología y riesgo de transmisión de Trypanosoma cruzi Chagas demuestran que es una especie importante desde el punto de vista de salud pública. Con el propósito de ampliar el conocimiento biológico sobre la especie, en el presente estudio se hace la descripción de la hembra así como la genitalia externa del macho, en ejemplares capturados en el estado de Guanajuato. Triatoma mexicana was originally described in 1848 by Herrich-Schaeffer, naming Conorhinus mexicanus Herrich-Schaeffer. Its finding is currently registered in the States of Guanajuato, Hidalgo, Querétaro, and San Luis Potosí. Studies about the spatial distribution, the entomological indices, it presence indoor an outdoor in houses, it biology and risk of transmission of Trypanosoma cruzi Chagas show that it is an important species from the point of view of public health. With the purpose of extending the biological knowledge of this species, the present study is the description of the female as well as the external male genitalia, in specimens captured in the State of Guanajuato.
Monitoreo de resistencia a insecticidas en poblaciones de campo de Triatoma infestans y Rhodnius prolixus, insectos vectores de la Enfermedad de Chagas
Claudia V. Vassena,María Inés Picollo
RETEL : Revista de Toxicología en Línea , 2003,
Abstract: Pyrethoid insecticides were used in Argentina for the control of Chagas Disease Vectors since 1980. A programmer to monitor the development of insecticide resistance in Triatoma infestans field populations exposed to insecticides was developed in our laboratory since 1996. The application of the protocol recommended by the World health Organization to determine resistance in T. infestans and Rhodnius prolixus, resulted in the detection and determination of the resistance ratios to pyrethroid insecticides in the field collected insects. Deltamethrin resistance was found in T. infestans field populations collected in localities of five provinces from Argentina (total evaluated: 14 provinces), in a Brazilian T. infestans population and in two Venezuelan Rhodnius prolixus samples. Moreover resistance level to insecticides used in control of Chagas Disease vectors were assessed in a Brazilian T. infestans and Venezuelan R. prolixus. Resistance is acknowledged as one of the evolutionary strategies of the pest species, so the early detection of Triatomine resistance in some field populations demonstrated the genetic potential for resistance in these species.
Infestación por vectores de la Enfermedad de Chagas en cuatro zonas endémicas de la meseta central de Costa Rica
CALDERóN-ARGUEDAS,OLGER; TROYO,ADRIANA; CASTRO,ALFREDO; GUERRERO,OLGA; CHINCHILLA,MISAEL;
Parasitología latinoamericana , 2002, DOI: 10.4067/S0717-77122002000300002
Abstract: an entomological search for vectors of chagas` disease was performed in 157 houses located in 4 endemic regions of the central plateau of costa rica. thirteen of the houses (8.3%) were positive for triatoma dimidiata (hemiptera: reduviidae) the only triatomine species found. the bugs were collected mainly in peridomestic piles of firewood (95.2%) and 8.1% of all the insects were infected by trypanosoma cruzi. the low abundance of chagas' disease vectors and the their low infestation rates could be attributed to the improvement of the living conditions in the four study zones. the data also suggests that the impact of t. cruzi infection in costa rican populations could be low and the prevalence of t. cruzi could be linked to zoonotic cycles
Relevamiento de vectores de la Enfermedad de Chagas en peridomicilios del área rural del Departamento Ayacucho, San Luis, Argentina Survey of Chagas disease vectors over peridomiciles of the Ayacucho department rural area, province of San Luis, Argentina  [cached]
Diego I. Chartier,Liliana B. Crocco
Revista de la Sociedad Entomol?3gica Argentina , 2007,
Abstract: Debido a la importancia de las poblaciones peridomésticas en los procesos de reinfestación de las viviendas, el objetivo de este trabajo fue evaluar la presencia de triatominos en peridomicilios de la comuna de San Francisco del Monte de Oro, Dpto. Ayacucho, San Luis, Argentina. Se evaluó la presencia de triatominos en 18 peridomicilios entre los meses de Octubre a Marzo (2003/2004), para cada anexo se analizó: tipo de construcción, hospedador y número de triatominos. Los triatominos capturados fueron determinados taxonómicamente y se analizó su infectividad. El 98,3 % de los triatominos pertenecieron a la especie Triatoma infestans (Klug). El 79,3 % de los anexos evaluados fueron positivos. Los índices de infestación para corrales y gallineros fueron de 94,4? % y 54,5? %, respectivamente. No se encontraron insectos infectados con Trypanosoma cruzi (Chagas). Los corrales se diferenciaron en: pirca, empalizada y troncos apilados horizontalmente. En cuanto al número de triatominos, sólo se halló diferencia significativa entre los corrales de pirca y empalizada, siendo el primero mayor (p< 0,05). Los corrales de pirca parecen ser los más aptos para refugios de los triatominos, probablemente debido a la gran cantidad de espacios vacíos que ofrece y a una mayor dificultad para el control químico. Due to the importance of peridomestic populations in the reinfestation process of the domicile, the aim of this work was to evaluate the presence of triatomines in peridomiciles located in the San Francisco del Monte de Oro community, Ayacucho dept., Argentina. The presence of triatomines was evaluated in 18 peridomiciles between the months of October to March (2003/2004). The type of construction, host and number of triatomines were recorded for each peridomestic annex. The captured triatomines were taxonomically classified and their infectivity recorded. The 98.3 % of the triatomines corresponded to the species Triatoma infestans (Klug). The 79.3 % of the evaluated annex were found positive. The infestation indexes for goat corrals and chicken coops were 94.4 % and 54.5 %, respectively. There were no insects infected with Trypanosoma cruzi (Chagas). The corrals were differentiated in: stone pile, palisade and wood pile. Stone pile corrals showed larger number of triatomines than the palisade corrals (p< 0,05) Stone pile corrals seem to offer an adequate shelter for triatomines, probably due to the high number of empty spaces that offer and a higher difficulty for chemical control.
Primer hallazgo de vectores de la enfermedad de Chagas asociados a matorrales silvestres en la Región Metropolitana, Chile First finding of Chagas disease vectors associated with wild bushes in the Metropolitan Region of Chile  [cached]
Antonella Bacigalupo B,José A Segura M,Alejandro García C,Javier Hidalgo C
Revista médica de Chile , 2006,
Abstract: Background: Insects of the subfamily triatominae are the biological vectors of Trypanosoma cruzi, the causal agent of Chagas disease. Aim: To search for wild colonies of triatomines in the Metropolitan Region of Chile. Material and Methods: Ad hoc traps were placed in two endemic zones of the Metropolitan Region of Chile, during 30 nights. The dejections of 16 T infestans and 43 M spinolai specimens were examined under the microscope, searching for live metacyclic trypomastigotes. A polymerase chain reaction (PCR) was performed in macerates of all insects looking for T cruzi DNA. Results: A total of 269 bugs were captured. Forty four were Triatoma infestans and 225 were Mepraia spinolai. They were not syntopic, since T infestans was restricted to a Southern zone (Calera de Tango) while M spinolai was only found in the Northern zone (Til-Til). Both species were found associated to terrestrial bromeliads (Puya sp) but M spinolai was also detected in stony grounds. Microscopic examination of dejections yielded a trypano-triatomine index of 56.3 and 32.6 for T infestans and M spinolai, respectively. PCR detected T cruzi DNA in 41 and 43% of T infestans and M spinolai specimens, respectively. Conclusions: The finding of T infestans in a wild habitat is noticeable. This is the first report of such phenomenon in Chile. The high infection rates with T cruzi, explains the maintenance of Chagas disease wild cycle in Chile
Infestación por vectores de la Enfermedad de Chagas en cuatro zonas endémicas de la meseta central de Costa Rica INFESTATION BY CHAGAS DISEASE VECTORS IN FOUR ENDEMIC ZONES OF THE CENTRAL PLATEAU OF COSTA RICA  [cached]
OLGER CALDERóN-ARGUEDAS,ADRIANA TROYO,ALFREDO CASTRO,OLGA GUERRERO
Parasitología latinoamericana , 2002,
Abstract: An entomological search for vectors of Chagas` disease was performed in 157 houses located in 4 endemic regions of the Central Plateau of Costa Rica. Thirteen of the houses (8.3%) were positive for Triatoma dimidiata (Hemiptera: Reduviidae) the only triatomine species found. The bugs were collected mainly in peridomestic piles of firewood (95.2%) and 8.1% of all the insects were infected by Trypanosoma cruzi. The low abundance of Chagas' disease vectors and the their low infestation rates could be attributed to the improvement of the living conditions in the four study zones. The data also suggests that the impact of T. cruzi infection in Costa Rican populations could be low and the prevalence of T. cruzi could be linked to zoonotic cycles
Situación de Mepraia spinolai, vector silvestre de la enfermedad de Chagas en Chile, en relación con otros vectores desde la perspectiva de sus fuentes de alimentación
Canals L,Mauricio; Ehrenfeld H,Mildred; Cattan A,PE;
Revista médica de Chile , 2000, DOI: 10.4067/S0034-98872000001000005
Abstract: background: three triatomine species, triatoma infestans, mepraia spinolai and mepraia gajardoi, are vectors for chagas disease in chile. aim: to compare the alimentary profile of mepraia spinolai, the chilean wild vector of chagas disease, with that of the several other triatomines. material and methods: the alimentary profile of mepraia spinolai was compared with that of other triatomines using cluster analysis (q and r techniques) with the jaccard index. results: three basic groups of triatomines were identified: domestic, wild and specialists, such as p. coreodes and c. pilosa. our wild vector m. spinolai was in an intermediate position between wild and domestic clusters, grouping with t. rubrovaria, t. sordida and p. megistus. the feeding sources, animals of the domestic and peri-domestic habitat and wild animals, corresponded to the clusters of the two groups. conclusions: mepraia spinolai, being a preponderantly wild species, approaches human dwellings and obtains food from domestic animals and eventually, from human blood (rev méd chile 2000; 128: 1108-12)
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