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Insecticide resistance, associated mechanisms and fitness aspects in two Brazilian Stegomyia aegypti (=  Aedes aegypti) populations
Abstract In Brazil, insecticide resistance in Stegomyia aegypti (= Aedes aegypti) (Diptera: Culicidae) populations to pyrethroids and to the organophosphate (OP) temephos is disseminated. Currently, insect growth regulators (IGRs) and the OP malathion are employed against larvae and adults, respectively. Bioassays with mosquitoes from two northeast municipalities, Crato and Aracaju, revealed, in both populations, susceptibility to IGRs and malathion (RR95 ≤ 2.0), confirming the effectiveness of these compounds. By contrast, temephos and deltamethrin (pyrethroid) resistance levels were high (RR95 > 10), which...
Source: Medical and Veterinary Entomology - July 28, 2017 Category: Veterinary Research Authors: P. F. VIANA ‐MEDEIROS, D. F. BELLINATO, A. J. MARTINS, D. VALLE Tags: Original Article Source Type: research

Amblyomma sculptum: genetic diversity and rickettsias in the Brazilian Cerrado biome
Abstract Amblyomma sculptum (Ixodida: Ixodidae) Berlese, 1888 is the most important tick vector in Brazil, transmitting the bioagent of the most severe form of spotted fever (SF) in part of the Cerrado (in the states of Minas Gerais and São Paulo). In another part of the Cerrado (Central‐West region of Brazil), a milder form of SF has been recorded. However, neither the rickettsia nor the vector involved have been characterized. The aim of the current study was to analyse genetic variation and the presence of rickettsia in A. sculptum in Cerrado, from silent areas and with the milder form of SF. Samples were subjected t...
Source: Medical and Veterinary Entomology - June 1, 2017 Category: Veterinary Research Authors: K. BITENCOURTH, M. AMORIM, S. V. DE OLIVEIRA, R. L. CAETANO, C. M. VOLOCH, G. S. GAZ ÊTA Tags: Original Article Source Type: research

The role of wing geometric morphometrics in the identification of sandflies within the subgenus Lutzomyia
Abstract The Lutzomyia subgenus (Diptera: Psychodidae) includes sibling species with morphologically indistinguishable females. The aims of this study were to analyse variations in the size and shape of wings of species within the Lutzomyia subgenus and to assess whether these analyses might be useful in their identification. Wings (n = 733) of 18 species deposited in Brazilian collections were analysed by geometric morphometrics, using other genera and subgenera as outgroups. Shape variation was summarized in multivariate analyses and differences in wing size among species were tested by analysis of variance. The resu...
Source: Medical and Veterinary Entomology - June 1, 2017 Category: Veterinary Research Authors: B. F. GIORDANI, A. J. ANDRADE, E. A. B. GALATI, R. GURGEL ‐GONÇALVES Tags: Original Article Source Type: research

Molecular Detection of Leishmania DNA in Wild-Caught Phlebotomine Sand Flies (Diptera: Psychodidae) From a Cave in the State of Minas Gerais, Brazil
Leishmania spp. are distributed throughout the world, and different species are associated with varying degrees of disease severity. In Brazil, Leishmania transmission involves several species of phlebotomine sand flies that are closely associated with different parasites and reservoirs, and thereby giving rise to different transmission cycles. Infection occurs during the bloodmeals of sand flies obtained from a variety of wild and domestic animals, and sometimes from humans. The present study focused on detection of Leishmania DNA in phlebotomine sand flies from a cave in the state of Minas Gerais. Detection of Leishmania...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: Carvalho, G. M. L., Brazil, R. P., Rego, F. D., Ramos, M. C. N. F., Zenobio, A. P. L. A., Andrade Filho, J. D. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Analysis of Amblyomma sculptum haplotypes in an area endemic for Brazilian spotted fever
In this study, the genetic diversity of A. sculptum populations in the state of Rio de Janeiro (RJ), Brazil, was investigated because genetic variability in tick populations may be related to vector competence. Samples of A. sculptum from 19 municipalities in 7 regions of RJ were subjected to DNA extraction, amplification and sequencing of D‐loop, cytochrome oxidase II and 12S rDNA mitochondrial genes. These sequences were used to map the genetic diversity of this tick. Amblyomma sculptum populations are genetically diverse in RJ, especially in the South Centre and Highland regions. Few unique haplotypes were observe...
Source: Medical and Veterinary Entomology - February 29, 2016 Category: Veterinary Research Authors: K. BITENCOURTH, C. M. VOLOCH, N. M. SERRA‐FREIRE, E. MACHADO‐FERREIRA, M. AMORIM, G. S. GAZÊTA Tags: Original Article Source Type: research

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