Sylvatic vectors invading houses and the risk of emergence of cases of Chagas disease in Salvador, State of Bahia, Northeast Brazil

Dias-Lima, Artur Gomes; Sherlock, Ítalo Rodrigues de Araújo

doi:10.1590/s0074-02762000000500004

Cited by 42 publications

(29 citation statements)

References 2 publications

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“…Nevertheless, according to the Brazilian Health Minister (BRASIL, 2005), the State of Bahia is the only one in the country that still presents infestation by T. infestans, with 93 of the 417 municipalities situated in risk areas or presenting the vectors over the past years. Moreover, there are reports that suggest the participation of triatomine bugs, otherwise considered sylvatic, in the transmission of the disease in that state, for instance T. pseudomaculata, T. tibiamaculata and T. brasiliensis (ALMEIDA et al, 2009;DIAS-LIMA;SHERLOCK, 2000;WALTER et al, 2005;SANTANA et al, 2011). Besides, this data suggest the maintenance of vectorial importance in T. cruzi transmission in that region.…”

Section: Resultsmentioning

confidence: 99%

First report of Trypanosoma cruziinfection in naturally infected dogs from southern Bahia, Brazil

Júnior

Almeida

Carvalho

et al. 2013

Rev. Bras. Parasitol. Vet.

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In order to verify the Trypanosoma cruzi infection in domestic domiciled dogs in a rural endemic area from the south region of the State of Bahia, Polymerase Chain Reaction (PCR) were performed using S35 and S36 primers in 272 dogs living in the district of Vila Operaria, in the municipality of Buerarema. All animals were clinically evaluated; 2.5 mL of blood were collected through venipuncture for the performance of molecular tests. None of these animals showed clinical signs of the illness and only two were identified with the DNA parasite. This result is the first report of natural infection by T. cruzi in domestic dogs in southern Bahia.Keywords: Trypanosoma cruzi, dog, PCR, Polymerase Chain Reaction, Bahia. ResumoCom o objetivo de verificar a infecção por Trypanosoma cruzi em cães domésticos domiciliados em área rural e endêmica do sul da Bahia, foi realizada a Reação em Cadeia da Polimerase (PCR), utilizando-se os iniciadores S35 e S36 em 272 cães domiciliados no distrito da Vila Operária, cidade de Buerarema. Todos os animais foram avaliados clinicamente e, posteriormente, foram coletados 2,5 mL de sangue por punção venosa para realização do diagnóstico molecular. Nenhum dos animais apresentou manifestação clínica da doença e, em apenas dois foram identificados DNA do parasito. Esse resultado é o primeiro relato de infecção natural por T. cruzi em cães domésticos no sul baiano.

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Section: Resultsmentioning

confidence: 99%

First report of Trypanosoma cruziinfection in naturally infected dogs from southern Bahia, Brazil

Júnior

Almeida

Carvalho

et al. 2013

Rev. Bras. Parasitol. Vet.

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“…Entre las principales causas de la domiciliación y el consecuente aumento del riesgo de transmisión de T. cruzi al hombre, se han señalado: la disminución de refugios y huéspedes de triatominos silvestres como resultado de la expoliación del bosque; la colonización humana junto con la mala calidad de la vivienda, y el efecto de la atracción de los triatominos por la luz artificial de las viviendas durante la noche (5,21,(38)(39)(40)(41)(42)(43). Esto último fue manifestado por los habitantes de esta zona durante el estudio.…”

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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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“…The level of adaptation of triatomines to human housing needs to be precisely evaluated to allow for the design of effective vector control strategies. Ensuring that the surroundings of residences have a low rate of infestation may constitute a barrier to the entry of these triatomines into homes 6,7 . According to the present study, among the 687 triatomines studied in the State of Pernambuco, T. brasiliensis, T. pseudomaculata, and P. lutzi were the most commonly found species.…”

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Description of the feeding preferences of triatominae in the Chagas disease surveillance study for the State of Pernambuco, Brazil (Hemiptera: Reduviidae)

Silva

Menezes

Farias

et al. 2017

Rev. Soc. Bras. Med. Trop.

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Introduction: Studying the feeding preferences of triatomines is an important entomological surveillance tool, since continuous surveillance of the disease is necessary. Methods: The precipitin reaction was used to describe the feeding preferences of triatomines along with their natural infection by flagellates similar to Tyrpanosoma cruzi. Six hundred eighty-seven insects were examined, including Triatoma brasiliensis, Triatoma pseudomaculata, and Panstrongylus lutzi. Results: Sixty-nine (10%) of 687 triatomines examined tested positive for flagellates similar to T. cruzi, and 8 (1.2%) of these fed on human blood. Conclusions: This study found potential transmitters of Chagas disease both inside and outside the domiciliar environment.

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Sylvatic vectors invading houses and the risk of emergence of cases of Chagas disease in Salvador, State of Bahia, Northeast Brazil

Cited by 42 publications

References 2 publications

First report of Trypanosoma cruziinfection in naturally infected dogs from southern Bahia, Brazil

First report of Trypanosoma cruziinfection in naturally infected dogs from southern Bahia, Brazil

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

Description of the feeding preferences of triatominae in the Chagas disease surveillance study for the State of Pernambuco, Brazil (Hemiptera: Reduviidae)

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