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
Article
Dans Anglais
| 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. .
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Classe sociale
/
Maladies cardiovasculaires
/
Syndrome métabolique X
/
Disparités de l'état de santé
Type d'étude:
Etude d'étiologie
/
Etude d'incidence
/
Étude observationnelle
/
Étude pronostique
/
Recherche qualitative
/
Facteurs de risque
Limites du sujet:
Adulte
/
Adulte très âgé
/
Enfant
/
Femelle
/
Humains
/
Mâle
/
Nouveau-né
Pays comme sujet:
Amérique du Sud
/
Brésil
/
Europe
langue:
Anglais
Texte intégral:
Rev. Soc. Bras. Med. Trop
Thème du journal:
Médecine tropicale
Année:
2015
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Fundação Oswaldo Cruz/BR
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