The impact of landscape transformation on the reinfestation rates of Rhodnius prolixus in the Orinoco Region, Colombia

Cordovez, Juan Manuel; Guhl, Felipe

doi:10.1016/j.actatropica.2015.07.030

Cited by 12 publications

(12 citation statements)

References 22 publications

(21 reference statements)

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“…Similar results considering sylvatic dispersion of triatomines could be expected in other municipalities of Casanare considering the above mentioned distribution of the rural population, the similarity in the ecological conditions of the rural areas in the Department [ 50 ], and the high prevalence of Trypanosoma cruz i infection in Casanare [ 42 ].…”

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

“…Casanare Department encompasses an area of 44,500 km 2 with a very low population density (7.44 persons/km 2 ) dispersed in rural areas [ 50 ]. In rural areas, people usually live in very similar settings: few isolated houses surrounded by palm trees of Attalea butyracea [ 44 , 49 , 50 ]. Two advantages were considered for sampling the model house in the present study: Firstly, a high concentration of palm trees to the north side of the house and the presence of a grassland space in between that allowed us to carry out the take-off experiments.…”

Section: Discussionmentioning

confidence: 99%

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Risks associated with dispersive nocturnal flights of sylvatic Triatominae to artificial lights in a model house in the northeastern plains of Colombia

et al. 2015

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BackgroundControl initiatives and continuous surveillance of vector-borne transmission have proved to be effective measures for diminishing the incidence of Chagas disease in endemic countries. However, the active dispersal of infected sylvatic adult triatomines by flight represents one of the main obstacles to eliminating domestic transmission.MethodsIn order to determine the risk that active dispersal of sylvatic adult triatomines represents in Colombian northeastern plains, we quantified the distribution and abundance of triatomines in palm trees (primarily Attalea butyracea) using live bait traps. Directional light traps were used to estimate the frequency of sylvatic triatomine dispersal and their possible origin. Finally, the effect of environmental parameters and artificial light sources on the take-off of sylvatic Rhodnius prolixus was evaluated in field experiments.ResultsR. prolixus was found in 90 % of the palm trees that densely aggregated toward the northern portion of the study area. R. prolixus, and three other sylvatic triatomine species were found to actively disperse and were attracted to the directional light traps (Triatoma maculata, Panstrongylus geniculatus and Psammolestes arthuri). Temperature, relative humidity, wind speed and night luminosity did not affect the active dispersal of the triatomines which is higher the first two hours after sunset. Artificial lights from houses at 60 and 110 m played a key role in the directionality of the R. prolixus take-offs. Trypanosoma cruzi was isolated from R. prolixus, T. maculata and P. geniculatus and was genotyped as T. cruzi I, III and IV.ConclusionsOur results highlight the potential risk in Colombian northeastern plains of actively dispersing sylvatic triatomines and their role in the domestic introduction of Discrete Typing Units of T. cruzi associated to sylvatic foci of Chagas disease transmission.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Risks associated with dispersive nocturnal flights of sylvatic Triatominae to artificial lights in a model house in the northeastern plains of Colombia

et al. 2015

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“… 17 When models had similar DIC values, the most parsimonious model (the one with the least number of parameters) was preferred. Spatial correlation between the values of FoI derived from the serological surveys (using model 3) was investigated by fitting semivariograms using the geoR package 18 (see text D of online supplementary data ).…”

Section: Methodsmentioning

confidence: 99%

Modelling historical changes in the force-of-infection of Chagas disease to inform control and elimination programmes: application in Colombia

et al. 2017

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BackgroundWHO's 2020 milestones for Chagas disease include having all endemic Latin American countries certified with no intradomiciliary Trypanosoma cruzi transmission, and infected patients under care. Evaluating the variation in historical exposure to infection is crucial for assessing progress and for understanding the priorities to achieve these milestones.MethodsFocusing on Colombia, all the available age-structured serological surveys (undertaken between 1995 and 2014) were searched and compiled. A total of 109 serosurveys were found, comprising 83 742 individuals from rural (indigenous and non-indigenous) and urban settings in 14 (out of 32) administrative units (departments). Estimates of the force-of-infection (FoI) were obtained by fitting and comparing three catalytic models using Bayesian methods to reconstruct temporal and spatial patterns over the course of three decades (between 1984 and 2014).ResultsSignificant downward changes in the FoI were identified over the course of the three decades, and in some specific locations the predicted current seroprevalence in children aged 0–5 years is <1%. However, pronounced heterogeneity exists within departments, especially between indigenous, rural and urban settings, with the former exhibiting the highest FoI (up to 66 new infections/1000 people susceptible/year). The FoI in most of the indigenous settings remain unchanged during the three decades investigated. Current prevalence in adults in these 15 departments varies between 10% and 90% depending on the dynamics of historical exposure.ConclusionsAssessing progress towards the control of Chagas disease requires quantifying the impact of historical exposure on current age-specific prevalence at subnational level. In Colombia, despite the evident progress, there is a marked heterogeneity indicating that in some areas the vector control interventions have not been effective, hindering the possibility of achieving interruption by 2020. A substantial burden of chronic cases remains even in locations where serological criteria for transmission interruption may have been achieved, therefore still demanding diagnosis and treatment interventions.

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“…10 In the Orinoco region, the annual area devoted to the plantation increases at a rate of 7,396.3 ha/year, 11 being one of the most noticeable land use alterations and replacing to a great extent the natural savanna. 11 Land use change has been suggested as major driver of the emergence of infectious diseases. 12 In particular, E. guineensis plantation establishment has the potential to significantly impact transmission of vector-borne diseases.…”

Section: Introductionmentioning

confidence: 99%

Rhodnius prolixus Colonization and Trypanosoma cruzi Transmission in Oil Palm (Elaeis guineensis) Plantations in the Orinoco Basin, Colombia

Erazo

González

Guhl

et al. 2020

The American Journal of Tropical Medicine and Hygiene

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Trypanosoma cruzi is the etiological agent of Chagas disease that infects more than seven million people in Latin America. The parasite is transmitted by triatomine insects, of which some species are often associated with palms. The establishment of oil palm plantations (Elaeis guineensis) in the Orinoco region (Colombia) has been rapidly growing, possibly constituting a new environment for the establishment and increase in triatomine populations. In this study, the potential of Rhodnius prolixus to colonize E. guineensis plantations and maintain T. cruzi transmission was assessed. Fieldwork was conducted in two areas located in the department of Casanare for sampling E. guineensis and Attalea butyracea palms, sampling for triatomines to determine their abundance and prevalence of T. cruzi infection. To assess T. cruzi transmission potential in the area, sylvatic and domestic mammals were sampled. Results showed that palm infestation with triatomines was higher in A. butyracea than in E. guineensis palms and T. cruzi infection in triatomines varied between habitats for one study area, but was constant in the other site. Trypanosoma cruzi-infected mammals in the E. guineensis plantations were mainly generalist rodents, suggesting that these mammals could have an important role in T. cruzi transmission in plantations. In conclusion, E. guineensis plantations in the Orinoco region are suitable habitats for R. prolixus and T. cruzi transmission.

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The impact of landscape transformation on the reinfestation rates of Rhodnius prolixus in the Orinoco Region, Colombia

Cited by 12 publications

References 22 publications

Risks associated with dispersive nocturnal flights of sylvatic Triatominae to artificial lights in a model house in the northeastern plains of Colombia

Risks associated with dispersive nocturnal flights of sylvatic Triatominae to artificial lights in a model house in the northeastern plains of Colombia

Modelling historical changes in the force-of-infection of Chagas disease to inform control and elimination programmes: application in Colombia

Rhodnius prolixus Colonization and Trypanosoma cruzi Transmission in Oil Palm (Elaeis guineensis) Plantations in the Orinoco Basin, Colombia

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