Phenotypic susceptibility to pyrethroids and organophosphate of wild Stomoxys calcitrans (Diptera: Muscidae) populations in southwestern France

Tainchum, Krajana; Sharif, Shukri; Duvallet, Gérard; Etienne, Lucas; Jacquiet, Philippe

doi:10.1007/s00436-018-6109-y

Cited by 26 publications

(25 citation statements)

References 14 publications

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“…underscores its importance. Pyrethroid resistance was reported in Europe and the US [145-147], and the phenotype was attributed, in part, to target site insensitivity at the knockdown resistance ( kdr ) locus of the voltage-sensitive sodium channel gene [148, 149]; there is evidence indicating additional mechanisms are involved. Metabolic detoxification of insecticides may contribute to pyrethroid resistance in stable flies, especially given the robust expansion of the CytP450 gene family.…”

Section: Resultsmentioning

confidence: 99%

Functional genomics of the stable fly,Stomoxys calcitrans, reveals mechanisms underlying reproduction, host interactions, and novel targets for pest control

Pu¹,

Aksoy²,

et al. 2019

Preprint

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57Background: The stable fly, Stomoxys calcitrans, is a major blood-feeding pest of livestock that 58 has near worldwide distribution, causing an annual cost of over $2 billion for control and product 59 loss in the United States alone. Control of these flies has been limited to increased sanitary 60 management practices and insecticide application for suppressing larval stages. Few genetic 61 and molecular resources are available to help in developing novel methods for controlling stable 62 flies. 63 64 Results: This study examines stable fly biology by utilizing a combination of high-quality 65 genome sequencing, microbiome analyses, and RNA-seq analyses targeting multiple 66 developmental stages and tissues. In conjunction, manual curation of over 1600 genes was 67 used to examine gene content related to stable fly reproduction, interactions with their host, 68 host-microbe dynamics, and putative routes for control. Most notable was establishment of 69 reproduction-associated genes and identification of expanded vision, chemosensation, immune 70 repertoire, and metabolic detoxification pathway gene families. 71 72 Conclusions: The combined sequencing, assembly, and curation of the male stable fly genome 73 followed by RNA-seq and downstream analyses provide insights necessary to understand the 74 biology of this important pest. These resources and knowledge will provide the groundwork for 75 expanding the tools available to control stable fly infestations. The close relationship of 76 Stomoxys to other blood-feeding (Glossina) and non-blood-feeding flies (medflies, Drosophila, 77 house flies) will allow for understanding the evolution of blood feeding among Cyclorrhapha 78 flies. 79 80 immunity 83 Additional File 1: Supplementary Material; Additional File 2: Supplementary Tables 84 Supplementary Dataset Files: 10 85 109 or a contaminated substrate to a susceptible host, association between specific vector and 110 pathogen is not necessary) of Equine infectious anemia, African swine fever, West Nile, and Rift 111 Valley Viruses, Trypanosoma spp., and Besnoitia spp. (reviewed by [13]). The apparent low 112 vector competence of stable flies implicates the importance of immune system pathways not 113 only in regulating larval survival in microbe-rich environments but also in the inability of 114 pathogens to survive and replicate in the adult midgut following ingestion [14-16]. 115 Stable fly mate location and recognition are largely dependent upon visual cues and contact 116 pheromones [17, 18], and gravid females identify suitable oviposition sites through a 117 combination of olfactory and contact chemostimuli along with physical cues [19, 20]. Since 118 stable flies infrequently associate with their hosts, feeding only 1 to 2 times per day, on-animal 119 5 and pesticide applications are less effective control efforts than those that integrate sanitation 120 practices with fly population suppression by way of traps [21]. Given the importance of 121 chemosensory and vision pathways, repellents have been ident...

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Section: Resultsmentioning

confidence: 99%

Functional genomics of the stable fly,Stomoxys calcitrans, reveals mechanisms underlying reproduction, host interactions, and novel targets for pest control

Pu¹,

Aksoy²,

et al. 2019

Preprint

View full text Add to dashboard Cite

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“…Sulfonamides have been proposed to diminish the clinical signs during the acute stage of the disease [10] but are totally ineffective in the chronic phase when the parasite is protected within the cysts. Resistance to insecticides has been increasingly detected in the eld in France [11] and Germany [12], making the control of vector transmission highly hypothetical. Finally, the control of bovine besnoitiosis relies entirely on ock management measures implemented after diagnostic test results are known.…”

Section: Read Full Licensementioning

confidence: 99%

Real-time PCR on skin biopsies for super-spreaders’ detection in bovine besnoitiosis

Grisez¹,

Bottari

Prévot

et al. 2020

Preprint

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Background: Bovine besnoitiosis, an emerging disease in Europe that can be transmitted by vectors, is caused by the apicomplexan Besnoitia besnoiti. Bovine besnoitiosis is difficult to control due to the complexity of its diagnosis in the acute stage of the disease, poor treatment success and chronically asymptomatic cattle acting as parasite reservoirs. When serological prevalence is low, detection and specific culling of seropositive cattle is feasible; however, economic considerations preclude this approach when serological prevalence is high. The aims of this study were to evaluate the accuracy of detection of super-spreaders in highly infected herds and to test their selective elimination as a new control strategy for bovine besnoitiosis. Methods: Previous real-time PCR analyses performed on skin tissues from 160 asymptomatic animals sampled at slaughterhouses showed that the tail base was the best location to evaluate the dermal parasite DNA load. All seropositive animals (n = 518) from eight dairy or beef cattle farms facing a high serological prevalence of besnoitiosis were sampled at the tail base and their skin sample analysed by real-time PCR. A recommendation of rapid and selective culling of super-spreaders was formulated and provided to the cattle breeders. Subsequent serological monitoring of naïve animals was used to evaluate the interest of this control strategy over time.Results: Among the 518 seropositive animals, a low proportion of individuals (14.5%) showed Cq values below 36, 17.8% had doubtful results (36 < Cq ≤ 40) and 67.8% had negative PCR results. These proportions were grossly similar on the eight farms, regardless of their production type (beef or dairy cattle), size, geographical location or history of besnoitiosis. Within two weeks of the biopsy, the rapid culling of super-spreaders was implemented on only three farms. The numbers of newly infected animals were lower on these farms compared to those where super-spreaders were maintained in the herd. Conclusions: Real-time PCR analyses performed on skin biopsies of seropositive cattle showed huge individual variabilities in parasite DNA load. The rapid culling of individuals considered as super-spreaders seems to be a new and encouraging strategy for bovine besnoitiosis control.

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“…Sulfonamides have been proposed to diminish the clinical signs during the acute stage of the disease [4] but are totally ineffective in the chronic phase when the parasite is protected within the cysts. Resistance to insecticides has been increasingly detected in the eld in France [12] and Germany [13], making the control of vector transmission highly hypothetical. Finally, the control of bovine besnoitiosis relies entirely on ock management measures implemented after diagnostic test results are known.…”

Section: Read Full Licensementioning

confidence: 99%

Super-spreaders: detection and culling in the control of bovine besnoitiosis.

Grisez¹,

Bottari

Prévot

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Background Bovine besnoitiosis is an emerging vector-borne disease in Europe caused by the Apicomplexa Besnoitia besnoiti. The mechanical transmission from infected to naïve hosts is permitted by horse flies and stable flies. Bovine besnoitiosis is difficult to control due to the complexity of its diagnosis in the acute stage of the disease, poor treatment success and chronically asymptomatic cattle acting as parasite reservoirs. When serological prevalence is low, detection and specific culling of seropositive cattle is feasible; however, economic considerations preclude this approach when serological prevalence is high. The aims of this study were to evaluate the accuracy of detection of super-spreaders in highly infected herds and to test their selective elimination as a new control strategy for bovine besnoitiosis. Methods Real-time PCR analyses performed on skin tissues from 160 asymptomatic animals sampled at slaughterhouses showed that the tail base was the best location to evaluate the dermal parasite DNA load. All seropositive animals (N = 518) from eight dairy or beef cattle farms facing a high serological prevalence of besnoitiosis were sampled and their skin analysed by real-time PCR. A recommendation of rapid and selective culling of super-spreaders was formulated and provided to the cattle breeders. Subsequent serological monitoring of naïve animals was used to evaluate the interest of this control strategy over time. Results Among the 518 seropositive animals, a low proportion of individuals (13%) showed Ct values below 36, 17% had doubtful results (36 < Ct ≤ 40) and 70% had negative PCR results. These proportions were grossly similar on the eight farms, regardless of their production type (beef or dairy cattle), size, geographic location or history of besnoitiosis. Within two weeks of the biopsy, the rapid culling of super-spreaders was implemented on only three farms. The numbers of newly infected animals were lower on these farms compared to those where super-spreaders were maintained in the herd. Conclusions Real-time PCR analyses performed on skin biopsies of seropositive cattle showed huge individual variabilities in parasite DNA load. The rapid culling of individuals considered as super-spreaders seems to be a new and encouraging strategy for bovine besnoitiosis control.

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Phenotypic susceptibility to pyrethroids and organophosphate of wild Stomoxys calcitrans (Diptera: Muscidae) populations in southwestern France

Cited by 26 publications

References 14 publications

Functional genomics of the stable fly,Stomoxys calcitrans, reveals mechanisms underlying reproduction, host interactions, and novel targets for pest control

Functional genomics of the stable fly,Stomoxys calcitrans, reveals mechanisms underlying reproduction, host interactions, and novel targets for pest control

Real-time PCR on skin biopsies for super-spreaders’ detection in bovine besnoitiosis

Super-spreaders: detection and culling in the control of bovine besnoitiosis.

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