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Medical and Veterinary Entomology

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https://www.readbyqxmd.com/read/28815634/effect-of-trapping-methods-on-the-estimation-of-alpha-diversity-of-a-phlebotomine-sandfly-assemblage-in-southern-mexico
#1
J J Rodríguez-Rojas, E A Rebollar-Téllez
The aims of the study were to (a) investigate the effect of trapping methods on alpha diversity; and (b) enhance the knowledge of the sandfly assemblage in the state of Quintana Roo. Field work was undertaken in a tropical forest of southern Mexico from August 2013 to July 2014. Sampling was conducted monthly during three consecutive nights. For each trapping night, 12 different types of trap were operated from 18.00 to 24.00 hours in four transects. Measures of alpha community diversity were based on the quantification of the number of species (Chao 2, Jackknife 2, Clench's equation, Margalef's index) and the community structure, as well as the dominance (Simpson and Berger-Parker indexes) and evenness (Shannon's entropy index, true diversity of the Jost and Pielou index)...
August 17, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28815682/molecular-evidence-for-trans-stadial-transmission-of-anaplasma-platys-by-rhipicephalus-sanguineus-sensu-lato-under-field-conditions
#2
M Aktas, S Ozubek
This study investigated the transmission of Anaplasma platys by Rhipicephalus sanguineus sensu lato (Ixodida: Ixodidae). Engorged nymphs (n = 404) removed from A. platys-infected dogs were incubated at 28 °C until moulting. Unfed adults were obtained and divided into 48 pools. Unfed ticks collected from the grounds of the dog shelter, comprising 1800 larvae (n = 18 pools), 3100 nymphs (n = 62 pools) and 85 adults (n = 10 pools, including three male and seven female pools) were sorted into 90 pools. All pools were screened by polymerase chain reaction for the 16S rRNA gene of A...
August 16, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28799248/molecular-detection-of-wolbachia-pipientis-in-natural-populations-of-sandfly-vectors-of-leishmania-infantum-in-endemic-areas-first-detection-in-lutzomyia-longipalpis
#3
N O DA Rocha, S M Lambert, A G Dias-Lima, F S Julião, B M P S Souza
A polymerase chain reaction-based method was used to screen sandflies for infection with Wolbachia (Rickettsiales: Rickettsiaceae), an intracellular bacterial endosymbiont found in many arthropods and filarial hosts. Positive results were obtained in five of 200 field-collected sandflies and were confirmed by sequencing. All sandflies were Lutzomyia longipalpis (Diptera: Psychodidae) captured in a region endemic for visceral leishmaniasis in Brazil. This is the first study to identify Wolbachia infection in this Lutzomyia species, which is the main vector of leishmaniasis in the study area...
August 11, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28782121/rift-valley-fever-virus-and-european-mosquitoes-vector-competence-of-culex-pipiens-and-stegomyia-albopicta-%C3%A2-aedes-albopictus
#4
M Brustolin, S Talavera, A Nuñez, C Santamaría, R Rivas, N Pujol, M Valle, M Verdún, A Brun, N Pagès, N Busquets
Rift Valley fever (RVF) is a mosquito-borne disease caused by the Rift Valley fever virus (RVFV). Rift Valley fever affects a large number of species, including human, and has severe impact on public health and the economy, especially in African countries. The present study examined the vector competence of three different European mosquito species, Culex pipiens (Linnaeus, 1758) form molestus (Diptera: Culicidae), Culex pipiens hybrid form and Stegomyia albopicta (= Aedes albopictus) (Skuse, 1894) (Diptera: Culicidae)...
August 7, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28771771/studies-on-the-behaviour-and-control-of-phlebotomine-sandflies-using-experimental-houses
#5
O D Kirstein, R Faiman, A Knigin, H Gueta, A Stone, A Warburg
Programmes for the control of phlebotomine sandflies (Diptera: Psychodidae), the vectors of leishmaniases, mainly target adults because larval breeding sites are generally unknown or inaccessible. To determine how blood-questing sandfly females enter homes and to develop means for their control, an experimental house (EH) was constructed in a village endemic for cutaneous leishmaniasis. Initially, carbon dioxide (CO2 )-baited suction traps were installed inside the EH to attract and capture sandflies. For other experiments, the windows of the EH were fitted with CO2 -baited window entrance traps (WETs) that allow each window to be considered as a separate unit...
August 3, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28766724/a-methodology-based-on-insecticide-impregnated-filter-paper-for-monitoring-resistance-to-deltamethrin-in-triatoma-infestans-field-populations
#6
C Remón, P Lobbia, E Zerba, G Mougabure-Cueto
The domiciliary presence of Triatoma infestans (Klug) (Hemiptera: Reduviidae) after control interventions was reported in recent years. Toxicological studies showed high levels of resistance to pyrethroids suggesting resistance as one of the main causes of deficient control. The aim of the present study was to develop a protocol to test resistance to deltamethrin in T. infestans collected from the field by discriminate concentration. To evaluate field insects, the effect of age (early vs. later) and nutritional state (starved vs...
August 2, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28752684/amblyomma-sculptum-genetic-diversity-and-rickettsias-in-the-brazilian-cerrado-biome
#7
K Bitencourth, M Amorim, S V DE Oliveira, R L Caetano, C M Voloch, G S Gazêta
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...
July 28, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28752627/vector-competence-of-northern-and-southern-european-culex-pipiens-pipiens-mosquitoes-for-west-nile-virus-across-a-gradient-of-temperatures
#8
C B F Vogels, G P Göertz, G P Pijlman, C J M Koenraadt
In Europe, West Nile virus (WNV) outbreaks have been limited to southern and central European countries. However, competent mosquito vectors and susceptible bird hosts are present in northern Europe. Differences in temperature and vector competence of mosquito populations may explain the absence of WNV outbreaks in northern Europe. The aim of the present study was to directly compare vector competence of northern and southern European Culex pipiens (Cx. p.) pipiens mosquitoes for WNV across a gradient of temperatures...
July 28, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28752548/insecticide-resistance-associated-mechanisms-and-fitness-aspects-in-two-brazilian-stegomyia-aegypti-%C3%A2-aedes-aegypti-populations
#9
P F Viana-Medeiros, D F Bellinato, A J Martins, D Valle
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...
July 28, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28748632/first-molecular-identification-of-the-vertebrate-hosts-of-culicoides-imicola-in-europe-and-a-review-of-its-blood-feeding-patterns-worldwide-implications-for-the-transmission-of-bluetongue-disease-and-african-horse-sickness
#10
J Martínez-DE LA Puente, J Navarro, M Ferraguti, R Soriguer, J Figuerola
Culicoides (Diptera: Ceratopogonidae) are vectors of pathogens that affect wildlife, livestock and, occasionally, humans. Culicoides imicola (Kieffer, 1913) is considered to be the main vector of the pathogens that cause bluetongue disease (BT) and African horse sickness (AHS) in southern Europe. The study of blood-feeding patterns in Culicoides is an essential step towards understanding the epidemiology of these pathogens. Molecular tools that increase the accuracy and sensitivity of traditional methods have been developed to identify the hosts of potential insect vectors...
July 27, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28722283/comparative-analysis-of-storage-conditions-and-homogenization-methods-for-tick-and-flea-species-for-identification-by-maldi-tof-ms
#11
A Nebbak, B El Hamzaoui, J-M Berenger, I Bitam, D Raoult, L Almeras, P Parola
Ticks and fleas are vectors for numerous human and animal pathogens. Controlling them, which is important in combating such diseases, requires accurate identification, to distinguish between vector and non-vector species. Recently, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) was applied to the rapid identification of arthropods. The growth of this promising tool, however, requires guidelines to be established. To this end, standardization protocols were applied to species of Rhipicephalus sanguineus (Ixodida: Ixodidae) Latreille and Ctenocephalides felis felis (Siphonaptera: Pulicidae) Bouché, including the automation of sample homogenization using two homogenizer devices, and varied sample preservation modes for a period of 1-6 months...
July 19, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28714569/seasonal-dynamics-of-the-tick-haemaphysalis-tibetensis-in-the-tibetan-plateau-china
#12
M Liu, T Li, Z J Yu, Z X Qiu, P Yan, Y Li, J Liu
The tick Haemaphysalis tibetensis (Acari: Ixodidae) Hoogstraal is an important arthropod vector widespread in the Qinghai-Tibet Plateau, and knowledge of its seasonal dynamics is still poor. The current study investigated the seasonal dynamics of the parasitic and non-parasitic H. tibetensis over a 2-year period from March 2014 to February 2016 in the Tibetan Plateau, China. During this timeframe, non-parasitic ticks were collected weekly by flag-dragging in grassland and shrubland areas, and parasitic ticks were removed weekly from selected sheep...
July 17, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28714540/anti-feeding-and-insecticidal-efficacy-of-a-topical-administration-of-dinotefuran-pyriproxyfen-permethrin-spot-on-vectra%C3%A2-3d-on-mice-against-stegomyia-albopicta-%C3%A2-aedes-albopictus
#13
D Tahir, B Davoust, L Almeras, J M Berenger, M Varloud, P Parola
An ectoparasiticide combining three active ingredients [dinotefuran, permethrin and pyriproxyfen (DPP)] was used in mice in an experiment designed to evaluate its anti-feeding and insecticidal efficacy against Stegomyia albopicta (= Aedes albopictus) (Diptera: Culicidae) mosquitoes. Twenty-two adult mice were randomly allocated into two groups consisting of an untreated control group and a DPP-treated group. Mice were exposed individually for 1 h to a mean ± standard deviation of 27 ± 2 starved female mosquitoes on days 1, 7, 14, 21 and 28 post-treatment...
July 17, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28707301/the-role-of-wing-geometric-morphometrics-in-the-identification-of-sandflies-within-the-subgenus-lutzomyia
#14
B F Giordani, A J Andrade, E A B Galati, R Gurgel-Gonçalves
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...
July 14, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28692183/host-range-and-distribution-of-small-mammal-fleas-in-south-africa-with-a-focus-on-species-of-medical-and-veterinary-importance
#15
L VAN DER Mescht, S Matthee
The host range and distribution of flea species on rodents and insectivores across multiple vegetation types in South Africa were investigated. Habitat suitability for flea species considered as important vectors of disease in humans and domestic animals was modelled. Data originated from fleas that were recovered from small mammals captured at 29 localities during 2009-2013 and published literature searched for flea records. Climate-based predictor variables, widely used in arthropod vector distribution, were selected and habitat suitability modelled for 10 flea vector species...
July 10, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28685834/molecular-survey-of-haemoplasmas-in-shelter-dogs-and-associations-with-rhipicephalus-sanguineus-sensu-lato
#16
M Aktas, S Ozubek
This study aimed to assess the occurrence of canine haemoplasma infection in domestic dogs and its possible trans-stadial transmission by Rhipicephalus sanguineus sensu lato (Ixodida: Ixodidae) in shelter dogs in Diyarbakır Province in southeast Turkey. Blood samples (n = 282) collected from domestic dogs were analysed by polymerase chain reaction (PCR) for the presence of canine haemoplasma. Fully engorged nymphs (n = 204) were removed from dogs that were positive for canine haemoplasma by PCR and maintained in an incubator at 28 °C for moulting...
July 7, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28671735/lifecycle-of-rhipicephalus-haemaphysaloides-under-laboratory-conditions
#17
G C P Diyes, D A Apanaskevich, R S Rajakaruna
Rhipicephalus haemaphysaloides Supino, 1897 (Ixodida: Ixodidae) is a three-host hard tick widely distributed in Sri Lanka. The lifecycle of the R. haemaphysaloides population in Sri Lanka was studied under laboratory conditions using fully engorged females collected from dogs. Larvae, nymphs and adults were reared on New Zealand rabbits. Engorged females weighed a mean ± standard deviation (SD) of 470.1 ± 106.5 mg and laid a mean ± SD of 4067.4 ± 3136.2 eggs within 16.1 ± 3.7 days. The mean ± SD preoviposition period was 6...
September 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28639697/determination-of-metabolic-resistance-mechanisms-in-pyrethroid-resistant-and-fipronil-tolerant-brown-dog-ticks
#18
A L Eiden, P E Kaufman, F M Oi, M J Dark, J R Bloomquist, R J Miller
Rhipicephalus sanguineus (Latreille) (Ixodida: Ixodidae) is a three-host dog tick found worldwide that is able to complete its' entire lifecycle indoors. Options for the management of R. sanguineus are limited and its' control relies largely on only a few acaricidal active ingredients. Previous studies have confirmed permethrin resistance and fipronil tolerance in R. sanguineus populations, commonly conferred by metabolic detoxification or target site mutations. Herein, five strains of permethrin-resistant and three strains of fipronil-tolerant ticks were evaluated for metabolic resistance using synergists to block metabolic enzymes...
September 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28639690/variation-in-host-preferences-of-malaria-mosquitoes-is-mediated-by-skin-bacterial-volatiles
#19
A O Busula, W Takken, J G DE Boer, W R Mukabana, N O Verhulst
The host preferences of the anthropophilic mosquito species in the Anopheles gambiae complex (Diptera: Culicidae) are mediated by skin bacterial volatiles. However, it is not known whether these mosquitoes respond differentially to skin bacterial volatiles from non-human host species. In this study, the responses of two malaria mosquito species in the An. gambiae complex, Anopheles gambiae s.s. (hereafter, An. gambiae) and Anopheles arabiensis, with different host preferences, to volatiles released from skin bacteria were tested...
September 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28429824/application-of-an-embryonated-chicken-egg-model-to-assess-the-vector-competence-of-australian-culicoides-midges-for-bluetongue-viruses
#20
M R VAN DER Saag, M P Ward, P D Kirkland
Culicoides biting midges (Diptera: Ceratopogonidae) are vectors of a number of globally important arboviruses that affect livestock, including bluetongue virus (BTV), African horse sickness virus and the recently emerged Schmallenberg virus. In this study, a model using embryonated chicken eggs (ECEs) was utilized to undertake vector competence studies of Australian Culicoides spp. for 13 laboratory-adapted or wild-type virus strains of BTV. A total of 7393 Culicoides brevitarsis were reared from bovine dung, and 3364 Culicoides were induced to feed from ECEs infected with different strains of BTV...
September 2017: Medical and Veterinary Entomology
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