Toxicological profile of deltamethrin in Triatoma brasiliensis (Hemiptera: Reduviidae) in State of Ceará, Northeastern Brazil
Rev. Soc. Bras. Med. Trop
;
48(1): 39-43, jan-feb/2015. tab
Artículo
en Inglés
| LILACS
| ID: lil-742971
ABSTRACT
INTRODUCTION:
Triatoma brasiliensis is the species of greatest epidemiological relevance in the semi-arid region of Brazil. This species is predominantly found in domestic environments, and it has the ability to build large colonies with high levels of natural infection via Trypanosoma cruzi. Thus, T. brasiliensis is one of the most efficient transmitters of Chagas disease (CD) to humans. Despite household spraying with residual insecticides, many areas report persistent reinfestations for reasons that remain poorly understood. Therefore, this study sought to characterize the toxicological profile of deltamethrin in T. brasiliensis from areas with persistent reinfestation in State of Ceará, Brazil.METHODS:
The susceptibility reference lineage (SRL) was derived from Umari. Serial dilutions of deltamethrin were prepared and applied to the dorsal abdomen of first instar nymphs. The control group received only pure acetone. Mortality was evaluated after 72h. Qualitative tests assessed mortality in response to a diagnostic dose of 1xLD99 (0.851 nanograms of active ingredient per treated nymph) of the SRL.RESULTS:
The susceptibility profile characterization of the T. brasiliensis populations revealed 50% resistance ratios (RR50) that ranged from 0.32 to 1.21. The percentage of mortality in response to the diagnostic dose was 100%.CONCLUSIONS:
We demonstrated that T. brasiliensis was highly susceptible to deltamethrin. The control difficulties found might be related to the recolonization of the triatomines originating from neighboring environments and the possible operational failures related to the process of spraying that enabled specimens less susceptible to deltamethrin to survive. .
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Índice:
LILACS (Américas)
Asunto principal:
Clase Social
/
Enfermedades Cardiovasculares
/
Síndrome Metabólico
/
Disparidades en el Estado de Salud
Tipo de estudio:
Estudio de etiología
/
Estudio de incidencia
/
Estudio observacional
/
Estudio pronóstico
/
Investigación cualitativa
/
Factores de riesgo
Límite:
Adulto
/
Anciano
/
Niño
/
Femenino
/
Humanos
/
Masculino
/
Recién Nacido
País/Región como asunto:
America del Sur
/
Brasil
/
Europa
Idioma:
Inglés
Revista:
Rev. Soc. Bras. Med. Trop
Asunto de la revista:
Medicina Tropical
Año:
2015
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Fundação Oswaldo Cruz/BR
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