Feeding frequency and nutritional status of peridomestic populations of Triatoma infestans from Argentina

López, Ana Graciela; Crocco, LB; Morales, Gonzalo; Catalá, Silvia

doi:10.1016/s0001-706x(99)00039-x

Cited by 46 publications

(43 citation statements)

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“…We observed differing counts of T. infestans between seasons. differences in host availability and feeding frequency by seasonality (López et al 1999, Ceballos et al 2005) and instar (Ceballos et al 2005), fecundity and mortality seasonality (Canals et al 1991) and different capacities to move (Vazquez-Prokopec et al 2006) along with their behavior to enter into an induced diapause when the environmental conditions are adverse (Canals et al 1992) may e�plain our results.…”

Section: Discussionmentioning

confidence: 59%

Sylvatic foci of the Chagas disease vector Triatoma infestans in Chile: description of a new focus and challenges for control programs

Bacigalupo¹,

Torres-Pérez

Segovia³

et al. 2010

Mem. Inst. Oswaldo Cruz

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Chagas disease, caused by the protozoan Trypanosoma cruzi and transmitted by triatomine insect vectors, affects about 10 million people worldwide (Schmunis 2000) and is the third most important global parasitic disease after malaria and schistosomiasis (World Bank 1993). Because of effective vector control campaigns, the number of acute cases has decreased markedly and has been reduced to nearly zero in previously highly endemic areas of Uruguay, Chile and Brazil (Schofield et al. 2006).The Chagas disease vector Triatoma infestans (Klug 1834) was historically considered an e�clusively do-) was historically considered an e�clusively domestic insect, but it has now been reported in sylvan environments (Noireau et al. 2005, Noireau 2009). The first sylvatic population of T. infestans was reported in Cochabamba, Bolivia, inhabiting rock piles associated with wild guinea pigs (Torrico 1946). Other reports have shown T. infestans in Argentina (Mazza & Schreiber 1938, Mazza 1943, Ceballos et al. 2009), Paraguay (Velasquez & González 1959 and Brazil (Barretto et al. 1963) under rocks or trunks of fallen trees, in hollow trees, under bark, in shelters or burrows of marsupials and rodents and in bird nests occupied by owls, parrots or small rodents (Noireau et al. 1997). Wild T. infestans has been found in an e�tended geographical region throughout Chaco and three Andean departments of Bolivia: Cochabamba, La Paz and Potosí (Noireau et al. 1999, Cortez et al. 2007. T. infestans was considered to be eradicable due to its strictly domestic behavior and its non-autochthonous status outside of its apparent centre of origin in the Andean valleys of Bolivia. This theory has been challenged by empirical evidence of wild individuals collected by vector control programs and researchers over several decades (Gürtler 2009). Sylvatic triatomines may occasionally invade human residences, acting as founders of new colonies (Fitzpatrick et al. 2008). Hence, it is necessary to study the ecology and behavior of their populations to understand the domiciliation process and generate new strategies for their control (Beard et al. 2002, Guhl et al. 2009, Moncayo & Silveira 2009).In Chile, parasite transmission from vectors to humans occurs mainly in rural and suburban areas encompassing the northern desert and semiarid and Mediterranean environments, between latitudes 18°30'S and 34°36'S. The triatomine insects T. infestans, Mepraia spinolai (Porter 1934) and Mepraia gajardoi are the vector species that have been reported in that area (Spinola 1852, Neghme 1982, Lent et al. 1994, Frias et al. 1998.In 1991, several countries of South America, including Chile, established the Southern Cone Initiative for control of Chagas disease (INCOSUR-Chagas), which provided united strategy, control actions and an information system used to evaluate local control programs (Silveira 2002). The specific aims of the initiative were the following: (i) the elimination of T. infestans from dwellings and their surroundings in endemic areas, (ii) the reduction an...

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Section: Discussionmentioning

confidence: 59%

Sylvatic foci of the Chagas disease vector Triatoma infestans in Chile: description of a new focus and challenges for control programs

Bacigalupo¹,

Torres-Pérez

Segovia³

et al. 2010

Mem. Inst. Oswaldo Cruz

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“…5,6,14 Our results show that the highest values of TcTRI are associated to domestic animals sharing the bedrooms with humans. Dogs inside the house were responsible for a higher infection of bugs and chickens inside were responsible for the highest triatomine population.…”

Section: Discussionmentioning

confidence: 60%

Entomological aspects of Chagas' disease transmission in the domestic habitat, Argentina

et al. 2004

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ObjectiveTo study the risk of Trypanosoma cruzi domestic transmission using an entomological index and to explore its relationship with household's characteristics and cultural aspects. Methods There were studied 158 households in an endemic area in Argentina. Each household was classified according to an entomological risk indicator (number of risky bites/ human). A questionnaire was administered to evaluate risk factors among householders. ResultsInfested households showed a wide range of risk values (0 to 5 risky bites/human) with skewed distribution, a high frequency of lower values and few very high risk households. Of all collected Triatoma infestans, 44% had had human blood meals whereas 27% had had dogs or chickens blood meals. Having dogs and birds sharing room with humans increased the risk values. Tidy clean households had contributed significantly to lower risk values as a result of low vector density. The infested households showed a 24.3% correlation between time after insecticide application and the number of vectors. But there was no correlation between the time after insecticide application and T. infestans' infectivity. The statistical analysis showed a high correlation between current values of the entomological risk indicator and Trypanosoma cruzi seroprevalence in children. ConclusionsThe risk of T. cruzi domestic transmission assessed using an entomological index show a correlation with children seroprevalence for Chagas' disease and householders' habits. Resumen Objetivo

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“…Ló pez and others reported that T. infestans from chicken coops had higher feeding rates and nutritional status during the spring and summer, and were predicted to have a low potential to flight dispersal. 25 Moreover, the probability of flight initiation of T. infestans was significantly associated with low nutritional status and high temperatures. 6 The increase of intake time from 30 to 120 minutes during development promoted changes in the expression of GPDH isoforms at the mRNA level (Figure 3).…”

Section: Discussionmentioning

confidence: 99%

Differential Expression of Glycerol-3-Phosphate Dehydrogenase Isoforms in Flight Muscles of the Chagas Disease Vector Triatoma infestans (Hemiptera, Reduviidae)

Stroppa

Lagunas²,

Carriazo³

et al. 2013

The American Journal of Tropical Medicine and Hygiene

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Abstract. Flight muscles of Triatoma infestans have two glycerol-3-phosphate dehydrogenase (GPDH) isoforms: GPDH-1 is involved in flight metabolism and GPDH-2 provides lipid precursors. Total GPDH activity was greater in the natural population and almost only due to GPDH-1. Different expression and activity observed between GPDH isoforms in the natural population and the first laboratory generation was not detected in the second laboratory generation. This pattern may be caused by gradual adaptation to laboratory nutritional conditions. During development, the expression of GPDH-2 increased with a longer time of intake, which would imply an increment in lipid biosynthesis. The GPDH-1 transcript predominated with respect to that of GPDH-2 in the lower nutritional condition, suggesting the necessity of insects to fly during this nutritional status. The transcriptional pattern showed a delay at 22 C. The isoforms activities and transcript patterns in flight muscles suggest transcriptional adaptation to metabolic requirements originated by alternative splicing.

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Feeding frequency and nutritional status of peridomestic populations of Triatoma infestans from Argentina

Cited by 46 publications

References 18 publications

Sylvatic foci of the Chagas disease vector Triatoma infestans in Chile: description of a new focus and challenges for control programs

Sylvatic foci of the Chagas disease vector Triatoma infestans in Chile: description of a new focus and challenges for control programs

Entomological aspects of Chagas' disease transmission in the domestic habitat, Argentina

Differential Expression of Glycerol-3-Phosphate Dehydrogenase Isoforms in Flight Muscles of the Chagas Disease Vector Triatoma infestans (Hemiptera, Reduviidae)

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