High density of Rhodnius prolixus in a rural house in Colombia

Sandoval, Claudia Magaly; Gutiérrez, Reinaldo; Luna, Sandra; Amaya, Maria; Esteban, Lyda; Ariza, Hector; Angulo, Vı́ctor Manuel

doi:10.1016/s0035-9203(00)90107-x

Cited by 11 publications

(5 citation statements)

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“…3 In Colombia, the Andean region in the eastern zone below 2,000 m above sea level has been considered endemic for Chagas disease because of the high degree of domiciliary infestation, wide dispersion, and the high densities of Rhodnius prolixus. 4,5 A decade after the adoption of a government program to control domiciliary triatomines, in our observation, this species has been controlled. However, another transmission scenario has begun to be known with checking of the wild cycle in peridomiciliary palms as a transmission risk factor in the departments of the eastern plains 6 and the reporting of high prevalence rates of human infection with T. cruzi.…”

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confidence: 57%

Human Trypanosomiasis in the Eastern Plains of Colombia: New Transmission Scenario

Angulo-Silva

Castellanos-Domínguez

Flórez-Martínez

et al. 2016

The American Society of Tropical Medicine and Hygiene

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Abstract. Characteristics of Trypanosoma cruzi infection were studied in a rural area of the eastern plains of Colombia. Using enzyme-linked immunosorbent assay and indirect fluorescent-antibody tests, the infection was determined in 11.6% of the inhabitants of 142 dwellings. During 6 months of community surveillance, in 42.3% dwellings, 609 triatomines were collected (597 Rhodnius prolixus and seven, three, one, and one of Panstrongylus geniculatus, Psammolestes arturi, Eratyrus mucronatus, and Triatoma maculata, respectively). Rhodnius prolixus was found in 80% peridomiciliary Attalea butyracea palms examined with baited traps, and its infection with T. cruzi was 30% and 38.5% in dwellings and palms, respectively. Trypanosoma cruzi was isolated in five of 35 triatomines and in one of 24 dogs. The blood of domestic and wild animals was identified in triatomines collected in the intradomicile and in palms. These results support the extension of the wild cycle of T. cruzi to human dwellings and the characterization of a new scenario for transmission in Colombia.Trypanosoma cruzi infection continues to affect nearly 6 million people in 21 countries of the Americas 1 despite the success of control programs against domestic triatomines. 2There are zones where dwellings are infested by other species of Triatominae with peridomiciliary and wild ecotopes. In the Amazon, some of the more than 27 wild species described, principally of the genus Rhodnius, have made incursions into dwellings, with the risk of infecting human populations. 3In Colombia, the Andean region in the eastern zone below 2,000 m above sea level has been considered endemic for Chagas disease because of the high degree of domiciliary infestation, wide dispersion, and the high densities of Rhodnius prolixus.4,5 A decade after the adoption of a government program to control domiciliary triatomines, in our observation, this species has been controlled. However, another transmission scenario has begun to be known with checking of the wild cycle in peridomiciliary palms as a transmission risk factor in the departments of the eastern plains 6 and the reporting of high prevalence rates of human infection with T. cruzi.7 This study was conducted for the purpose of clarifying the epidemiological characteristics of this scenario in this region.In December 2008, the prevalence of T. cruzi infection was evaluated in the inhabitants of 142 dwellings in the department of Casanare, dispersed in rural areas of the municipalities of Maní (04°49′02″N/72°17′19″W) and Aguazul (05°10′23″N/ 72°33′17″W), which were fumigated by the program of VectorTransmitted Diseases (Enfermedades Transmitidas por Vectores [ETV], in Spanish) in that department. This territory corresponds to the alluvial and eolic plains of the Orinoquía, composed of flooded savannas with herbaceous and graminaceous vegetation in the humid warm thermal floor, with an average temperature of 25-27°C and an annual rainfall of 2,400-2,600 mm (Figure 1).The dwellings are constructed with brick walls, cement, ti...

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mentioning

confidence: 57%

Human Trypanosomiasis in the Eastern Plains of Colombia: New Transmission Scenario

Angulo-Silva

Castellanos-Domínguez

Flórez-Martínez

et al. 2016

The American Society of Tropical Medicine and Hygiene

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“…Rhodnius prolixus (Hemiptera: Triatominae) is an obligate hematophagous insect with a wide geographical distribution that includes countries such as Colombia, Venezuela, Bolivia, Brazil, Costa Rica, El Salvador, Ecuador, Guatemala, Guiana, French Guiana, Honduras, Mexico, Nicaragua, Panama, Suriname, and Trinidad and Tobago 1 . Within the Triatominae subfamily, R. prolixus is considered an efficient vector of Trypanosoma cruzi due to its wide distribution 2 , its fast defecation during the blood-sucking process 3 , the presence of populations in sylvatic conditions 4 , and the presence of insects inside and around human dwellings 5 .…”

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confidence: 99%

Electrophysiological detection of visible wavelengths of artificial lights inducing take-off in adults of Rhodnius prolixus (Hemiptera: Triatominae)

Ortiz

Hincapié-Peñaloza

Molina

2023

Rev. Inst. Med. trop. S. Paulo

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Rhodnius prolixus is the most important vector of Trypanosoma cruzi in the northern part of South America. The compound eyes in adults of R. prolixus are involved in the nocturnal flight dispersion from sylvatic environments into human dwellings. During this behavior, the artificial lights play an important role in attracting R. prolixus; however, it is still not clear whether the compound eyes of this species use different visible wavelengths as a cue during active dispersion. We applied electrophysiological (electroretinography or ERG) and behavioral (take-off) experiments in a controlled laboratory setting to determine the spectral sensitivity of the compound eyes and the attraction of R. prolixus adults to discrete visible wavelengths. For the ERG experiments, flashes of 300 ms at wavelengths ranging between 350 and 700 nm at a constant intensity of 3.4 µW/cm 2 were tested after adaptation to darkness and to blue and yellow lights. For the behavioral experiments, the adults were exposed to nine visible wavelengths at three different intensities, and their direction of take-off in an experimental arena was established with circular statistics. The ERG results showed peaks of spectral sensitivity at 470–490 nm and 520–550 nm in adults, while behavioral experiments showed attractions to blue, green and red lights, depending on the intensity of the light stimuli. The electrophysiological and behavioral results confirm that R. prolixus adults can detect certain wavelengths in the visible spectrum of light and be attracted to them during take-off.

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“…La colonización y las altas densidades de R. prolixus en el intradomicilio han sido características en áreas rurales de la zona oriental, consideradas de gran riesgo para la transmisión de la enfermedad en Colombia (7)(8)(9)(10); otras especies, como T. dimidiata, T. maculata y T. venosa, colonizan las viviendas en menor grado. Como visitante frecuente se ha reportado P. geniculatus y, como esporádicos, R. (11)(12)(13)(14)(15).…”

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Attalea butyracea próximas a las viviendas como posible fuente de infestación domiciliaria por Rhodnius prolixus (Hemiptera: Reduviidae) en los Llanos Orientales de Colombia

2012

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Introducción. La presencia de Rhodnius prolixus en palmas en los Llanos Orientales, zona de alto riesgo para la infección por Trypanosoma cruzi, y su frecuente visita al intradomicilio, hacen necesario confirmar este hábitat como posible fuente de infestación. Objetivo. Comprobar la infestación por R. prolixus en Attalea butyracea próximas a viviendas en los Llanos Orientales. Materiales y métodos. Se examinaron palmas próximas a las viviendas rurales en los departamentos de Casanare y Arauca, utilizando trampas con cebo vivo, y mediante búsqueda activa y vigilancia comunitaria, se recolectaron triatominos en el intradomicilio. Con criterios morfológicos se determinó la especie recolectada y con la técnica de PCR se estableció la infección natural. Resultados. Se recolectaron 529 ninfas y adultos de R. prolixus y 5 ninfas de Eratyrus mucronatus en 111/172 (64,53 %) A. butyracea ubicadas a menos de 500 m de las viviendas. En el mismo periodo se recolectaron en el intradomicilio 132 R. prolixus y especímenes de Psammolestes arthuri, Cavernicola pilosa, Triatoma maculata, Panstrongylus geniculatus y 20 ninfas de E. mucronatus en un cúmulo de adobes en el corredor de una vivienda. Se detectó infección natural por T. cruzi en 28,76 % de R. prolixus de palmas y 30 % del intradomicilio. Conclusiones. Los resultados del presente estudio revelan una nueva situación epidemiológica de transmisión de la enfermedad de Chagas, caracterizada por las altas tasas de infestación de R. prolixus en palmas próximas a viviendas y su frecuente intrusión; su impacto debe ser evaluado para diseñar medidas de prevención de la enfermedad.Palabras clave: Rhodnius, Triatominae, enfermedad de Chagas, Trypanosoma cruzi, Colombia.Attalea butyracea palms adjacent to housing as a source of infestation by Rhodnius prolixus (Hemiptera: Reduviidae) Introduction. The presence of Rhodnius prolixus in palms on the eastern plains area of Colombia provide a high risk for infection with Trypanosoma cruzi. Intensive surveillance of the palm tree habitat are necessary to confirm the presence of bugs and provide evidence that this habitat is a source of house infestations. Objective. The infestation by R. prolixus in the palm, Attalea butyracea, was investigated near homes for assessment of risk. Materials and methods. Palms were examined for Rhodnius bugs adjacent to rural housing in the eastern plains provinces of Casanare and Arauca, Colombia. Bait traps were used as well as an active search by the investigators and a community watch program to collect intradomiciliary triatomine bugs. Collected species were identified by morphological criteria,and natural T.cruzi infections in the triatomine bugs were detected by the PCR technique. Results. In 111 of 172 (64.5%) palms (A. butyracea) inspected, 529 nymphs and adults of R. prolixus and 5 nymphs of Eratyrus mucronatus were collected. The A. butyracea were located within 500 m of housing. In the same period, 132 R. prolixus and specimens of the triatomine species Psammolestes arthuri, Cavernicola pilosa, Tr...

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High density of Rhodnius prolixus in a rural house in Colombia

Cited by 11 publications

References 5 publications

Human Trypanosomiasis in the Eastern Plains of Colombia: New Transmission Scenario

Human Trypanosomiasis in the Eastern Plains of Colombia: New Transmission Scenario

Electrophysiological detection of visible wavelengths of artificial lights inducing take-off in adults of Rhodnius prolixus (Hemiptera: Triatominae)

Attalea butyracea próximas a las viviendas como posible fuente de infestación domiciliaria por Rhodnius prolixus (Hemiptera: Reduviidae) en los Llanos Orientales de Colombia

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