Cuticular hydrocarbons of Chagas disease vectors in Mexico

Capillary gas-liquid chromatography was used to analyse the cuticular hydrocarbons of three triatomine species, Triatoma dimidiata, T. barberi and Dipetalogaster maxima, domestic vectors of Chagas disease in Mexico. Mixtures of saturated hydrocarbons of straight and methyl-branched chains were characteristic of the three species, but quantitatively different. Major methylbranched components mostly corresponded to different saturated isomers of monomethyl, dimethyl and trimethyl branched hydrocarbons ranging from 29 to 39 carbon backbones. Sex-dependant, quantitative differences in certain hydrocarbons were apparent in T. dimidiata.Facultad de Ciencias Médica

Cuticular hydrocarbons of Chagas disease vectors in Mexico

Capillary gas-liquid chromatography was used to analyse the cuticular hydrocarbons of three triatomine species, Triatoma dimidiata, T. barberi and Dipetalogaster maxima, domestic vectors of Chagas disease in Mexico. Mixtures of saturated hydrocarbons of straight and methyl-branched chains were characteristic of the three species, but quantitatively different. Major methylbranched components mostly corresponded to different saturated isomers of monomethyl, dimethyl and trimethyl branched hydrocarbons ranging from 29 to 39 carbon backbones. Sex-dependant, quantitative differences in certain hydrocarbons were apparent in T. dimidiata.Facultad de Ciencias Médica

Phylogeography and Genetic Variation of Triatoma dimidiata, the Main Chagas Disease Vector in Central America, and Its Position within the Genus Triatoma

Chagas disease is a serious parasitic disease of Latin America. Human contamination in poor rural or periurban areas is mainly attributed to haematophagous triatomine insects. Triatoma includes important vector species, as T. dimidiata in Central and Meso-America. DNA sequences, phylogenetic methods and genetic variation analyses are combined in a large interpopulational approach to investigate T. dimidiata and its closest relatives within Triatoma. The phylogeography of Triatoma indicates two colonization lineages northward and southward of the Panama isthmus during ancient periods, with T. dimidiata presenting a large genetic variability related to evolutionary divergences from a Mexican-Guatemalan origin. One clade remained confined to Yucatan, Chiapas, Guatemala and Honduras, with extant descendants deserving species status: T. sp. aff. dimidiata. The second clade gave rise to four subspecies: T. d. dimidiata in Guatemala and Mexico (Chiapas) up to Honduras, Nicaragua, Providencia island, and introduced into Ecuador; T. d. capitata in Panama and Colombia; T. d. maculipennis in Mexico and Guatemala; and T. d. hegneri in Cozumel island. This taxa distinction may facilitate the understanding of the diversity of vectors formerly included under T. dimidiata, their different transmission capacities and the disease epidemiology. Triatoma dimidiata will offer more problems for control than T. infestans in Uruguay, Chile and Brazil, although populations in Ecuador are appropriate targets for insecticide-spraying

Ninfa 4 de Meccus pallidipennis

En 1936, Mazzotti informó de este vector en Oaxaca como el primer triatomino infectado con Trypanosoma cruzi en México; Meccus pallidipennis es uno de los transmisores peridomésticos más importantes de la Enfermedad de Chagas, además de ser endémico en México, se ha reportado en 13 estados (Colima, Estado de México, Guanajuato, Guerrero, Jalisco, Michoacán, Morelos, Nayarit, Oaxaca, Puebla, Querétaro, Veracruz y Zacatecas); se ha encontrado en altitudes de 200 a 1580 m sobre el nivel del mar. La hembra mide de 32-35 mm y el macho mide de 31-34 mm

Ninfa 3 de Meccus pallidipennis

En 1936, Mazzotti informó de este vector en Oaxaca como el primer triatomino infectado con Trypanosoma cruzi en México; Meccus pallidipennis es uno de los transmisores peridomésticos más importantes de la Enfermedad de Chagas, además de ser endémico en México, se ha reportado en 13 estados (Colima, Estado de México, Guanajuato, Guerrero, Jalisco, Michoacán, Morelos, Nayarit, Oaxaca, Puebla, Querétaro, Veracruz y Zacatecas); se ha encontrado en altitudes de 200 a 1580 m sobre el nivel del mar. La hembra mide de 32-35 mm y el macho mide de 31-34 mm

Ninfa 2 de Meccus pallidipennis

En 1936, Mazzotti informó de este vector en Oaxaca como el primer triatomino infectado con Trypanosoma cruzi en México; Meccus pallidipennis es uno de los transmisores peridomésticos más importantes de la Enfermedad de Chagas, además de ser endémico en México, se ha reportado en 13 estados (Colima, Estado de México, Guanajuato, Guerrero, Jalisco, Michoacán, Morelos, Nayarit, Oaxaca, Puebla, Querétaro, Veracruz y Zacatecas); se ha encontrado en altitudes de 200 a 1580 m sobre el nivel del mar. La hembra mide de 32-35 mm y el macho mide de 31-34 mm

Huevos de Meccus pallidipennis

En 1936, Mazzotti informó de este vector en Oaxaca como el primer triatomino infectado con Trypanosoma cruzi en México; Meccus pallidipennis es uno de los transmisores peridomésticos más importantes de la Enfermedad de Chagas, además de ser endémico en México, se ha reportado en 13 estados (Colima, Estado de México, Guanajuato, Guerrero, Jalisco, Michoacán, Morelos, Nayarit, Oaxaca, Puebla, Querétaro, Veracruz y Zacatecas); se ha encontrado en altitudes de 200 a 1580 m sobre el nivel del mar. La hembra mide de 32-35 mm y el macho mide de 31-34 mm