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Eficácia acaricida de uma emulsão contendo 10% de óleo de nim (Azadirachta indica) no controle de Psoroptes ovis em coelhos naturalmente infestados

Fernandes,Julio I.; Verocai,Guilherme G.; Ribeiro,Francisco A.; Melo,Raquel M.P.S.; Correia,Thais R.; Veiga,Cristiano C.P.; Vieira,Vanessa P.C.; Scott,Fabio B.
Fonte: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 PT
Relevância na Pesquisa
47.12%
O objetivo do presente estudo foi avaliar a eficácia de uma emulsão contendo 10% de óleo de nim, Azadirachta indica, no controle de Psoroptes ovis em coelhos naturalmente infestados. Foram utilizados 12 coelhos separados aleatoriamente em dois grupos de seis animais cada. O grupo controle permaneceu sem tratamento, enquanto que o grupo tratado recebeu a formulação em teste, contendo 10% de Nim, borrifando ambos os condutos auditivos, uma vez ao dia, por sete dias consecutivos. Os animais foram avaliados diariamente para observação de possíveis efeitos adversos do produto. Nos dias +3, +7, +14,+21, +28 e +35 foi coletado material de todos os animais para avaliação da presença de ácaros vivos. Os coelhos do grupo controle apresentavam ácaros em ambos os condutos auditivos em todos os dias de observação. O grupo tratado apresentou eficácia de 41,7% no dia +3 e 100% a partir do dia +7 até o dia +35. O produto demonstrou ser eficaz no tratamento da sarna psoróptica em coelhos. Entretanto, todos os animais tratados apresentaram reações dermatológicas, tais como alopecia e hiperemia no local de aplicação do produto, variando de baixa a média severidade.

Efficacy of the d-phenothrin/pyriproxyfen association against mites in naturally co-infested rabbits

Fernandes,Julio I.; Verocai,Guilherme G.; Ribeiro,Francisco A.; Melo,Raquel M.P.S.; Correia,Thaís R.; Coumendouros,Katherina; Scott,Fabio B.
Fonte: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2013 EN
Relevância na Pesquisa
26.79%
The aim of the present study was to evaluate the efficacy of the d-phenothrin/pyriproxyfen association against Psoroptes ovis, Cheyletiella parasitivorax, and Leporacarus gibbus infestations in naturally co-infested rabbits. Twenty crossbreed (New Zealand White x California) rabbits concurrently infested by the three mite species were randomly divided in two groups. All rabbits presented with hyperemia, erythema and formation of crusts in the ear canals caused by P. ovis. Infestations by both C. parasitivorax and L. gibbus were considered asymptomatic in all animals.Ten animals were treated with a 4.4% d-phenothrin and 0.148% pyriproxyfen spray formulation until have their body surface uniformly sprayed, including external ear canals. The other ten rabbits remained untreated, serving as control group. Observations were done on days +7, +14, +21, +28, and +35 post-treatment. The d-phenothrin/pyriproxyfen association showed 100% efficacy against the three mite species and was responsible for the remission of psoroptic mange lesions on treated animals. No signs of intoxication were observed. The results indicate that d-phenothrin/pyriproxyfen spray formulation in a single application is an effective and clinically safe option for the control of different mite infestations in rabbits.

Eficácia da ivermectina oral no controle de Psoroptes ovis e Leporacarus gibbus em coelhos naturalmente infestados

Coelho,Cristiane N.; Nunes,Tiago A.P.; Batista,Lilian Cristina de S.O.; Silva,Diego D. da; Santos,Rosângela R. dos; Correia,Thaís R.; Scott,Fabio B.; Fernandes,Julio I.
Fonte: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 PT
Relevância na Pesquisa
67.6%
O objetivo do trabalho foi avaliar a eficácia da ivermectina administrada por via oral no controle de Psoroptes ovis e Leporacarus gibbus em coelhos naturalmente infestados. Foram selecionados 20 coelhos adultos, distribuídos na mesma proporção de ambos os sexos, em dois grupos experimentais, compondo dez animais por grupo. No grupo controle foi administrado o mesmo volume do tratamento de solução salina, enquanto o grupo tratado recebeu dose única de ivermectina oral (400 µg/Kg). O diagnóstico dos ácaros foi realizado com auxílio de microscópio estereoscópico após a devida coleta de material. Para P. ovis foi realizada através de coleta do cerúmen com auxílio de zaragatoas efetuadas nas orelhas e para por L. gibbus foi realizada coleta de pelos nas regiões do pescoço dorsal, lombar direita, lombar esquerda, cauda ventral e abdômen ventral. A avaliação da eficácia e a avaliação clínica das lesões, mensuradas em escores (grau 0 a 4) foi realizada nos dias 0, +3, +7, +14, +21, +28 e + 35, após o tratamento. Foi observada a eficácia de 100% no controle de P. ovis a partir do dia +7 e para L. gibbus a partir do dia +14, mantendo-se negativos até o final do período experimental. O escore da lesão das orelhas do grupo tratado regrediu a partir do dia +14 e no dia +21 todos os animais atingiram grau 0. No grupo controle...

Raillietia caprae (Acari: Raillietidae) and Psoroptes ovis (Acari: Psoroptidae) in the ears of goats in the state of Rio de Janeiro, Southeast Brazil

Faccini,João Luiz H.; Ribeiro,Vinicius R.
Fonte: Colégio Brasileiro de Parasitologia Veterinária Publicador: Colégio Brasileiro de Parasitologia Veterinária
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2008 EN
Relevância na Pesquisa
67.42%
Ear cannals of 145 domestic goats including the breeds Saanen, Toggenburg, Anglobian, Alpine, Moxoto (native) and crossbred goats from 10 smallholder farms were examined by flushing for the presence of ear mites. Prevalence of Raillietia caprae Quintero, Bassols and Acevedo, 1980 was much more higher than Psoroptes ovis (Hering, 1838) in the studied area, respectively 62% ( 90/145) and 4% ( 6/145). The youngest animal parasitized was eight months old and the oldest was 10 years old. Subclinical otitis is a common feature of infestation by both species but increase of wax and the presence of pus were detected in the flushed material in approximately 10% of the goats examined.

Seasonal prevalence and mean intensity of Psoroptes ovis infestation in goats in the Brazilian semiarid region

Amorim,Malba Gean Rodrigues de; Azevedo,Sérgio Santos; Riet-Correa,Franklin
Fonte: Colégio Brasileiro de Parasitologia Veterinária Publicador: Colégio Brasileiro de Parasitologia Veterinária
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2015 EN
Relevância na Pesquisa
57.5%
To determine the prevalence and seasonal variation of Psoroptes ovis (Delafond, 1858) mange in goats in the semiarid region of Paraíba, 541 crossbred goats of both sexes and different ages were examined between June 1999 and May 2001 and between August 2011 and December 2012, by washing their ear canals. The monthly prevalence of the infestation varied between 66.66% and 100% without significant differences (p = 0.10) among months and years. The intensity of infestation was higher between 2011–2012 (p < 0.05), with an annual rainfall of 123 mm, than between 1999-2000, which had an annual rainfall of 614.9 mm. By the Spearman test there was a negative correlation between the relative humidity and the rainfall of the intensity of the P. ovis infestation. It is concluded that parasitism by P. ovis occurs at a similar prevalence rate during the entire year but increases during dry years.

Identification of Bacterial Species Associated with the Sheep Scab Mite (Psoroptes ovis) by Using Amplified Genes Coding for 16S rRNA

Hogg, J. C.; Lehane, M. J.
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /09/1999 EN
Relevância na Pesquisa
47.25%
This was the first molecular study of the bacterial flora of the sheep scab mite (Psoroptes ovis). A sequence analysis of genes coding for 16S rRNA revealed that Serratia marcescens and bacteria closely related to Staphylococcus intermedius or Staphylococcus chromogens and Alloiococcus otitidis were present. These bacteria were associated with skin lesions, dermatitis, and otitis media caused by P. ovis.

Feeding-associated gene expression in sheep scab mites (Psoroptes ovis)

McNair, Carol M.; Billingsley, Peter F.; Nisbet, Alasdair J.; Knox, Dave P.
Fonte: EDP Sciences Publicador: EDP Sciences
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
47.12%
The mite Psoroptes ovis is the causative agent of sheep scab. Although not usually fatal, the disease can spread rapidly and is a serious animal welfare concern. Vaccine development against ectoparasites has primarily focussed on two sources of candidate vaccine antigens – “exposed” antigens that are secreted in saliva during feeding on a host and “concealed” antigens that are usually expressed in the parasite gut and may be involved in digestion. Here, we sought to identify genes encoding proteins important for mite feeding and digestion by a subtractive suppressive hybridisation approach comparing mRNA transcript abundance in “fed” and “starved” mites. The study identified a variety of genes which are up-regulated by feeding mites. These included group 1, 5, 7 and 13 allergens including the previously described cysteine protease Pso o 1. In addition, numerous novel genes were identified here including some encoding potential salivary gland proteins and others encoding proteins which may facilitate feeding such as a serum opacity factor. An olfactory receptor-like protein was identified in the starved mite population which may help the mite to identify a host.

Transcriptomic analysis of the temporal host response to skin infestation with the ectoparasitic mite Psoroptes ovis

Burgess, Stewart TG; Frew, David; Nunn, Francesca; Watkins, Craig A; McNeilly, Tom N; Nisbet, Alasdair J; Huntley, John F
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 10/11/2010 EN
Relevância na Pesquisa
26.54%

Generation, analysis and functional annotation of expressed sequence tags from the ectoparasitic mite Psoroptes ovis

Burgess, Stewart TG; Nisbet, Alasdair J; Kenyon, Fiona; Huntley, John F
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 22/07/2011 EN
Relevância na Pesquisa
26.54%

Host Transcription Factors in the Immediate Pro-Inflammatory Response to the Parasitic Mite Psoroptes ovis

Burgess, Stewart T. G.; McNeilly, Tom N.; Watkins, Craig A.; Nisbet, Alasdair J.; Huntley, John F.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 07/09/2011 EN
Relevância na Pesquisa
26.54%

The use of a Psoroptes ovis serodiagnostic test for the analysis of a natural outbreak of sheep scab

Burgess, Stewart TG; Innocent, Giles; Nunn, Francesca; Frew, David; Kenyon, Fiona; Nisbet, Alasdair J; Huntley, John F
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 10/01/2012 EN
Relevância na Pesquisa
26.54%

Quantitative PCR-based genome size estimation of the astigmatid mites Sarcoptes scabiei, Psoroptes ovis and Dermatophagoides pteronyssinus

Mounsey, Kate E; Willis, Charlene; Burgess, Stewart TG; Holt, Deborah C; McCarthy, James; Fischer, Katja
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 04/01/2012 EN
Relevância na Pesquisa
26.54%

Development of a cDNA microarray for the measurement of gene expression in the sheep scab mite Psoroptes ovis

Burgess, Stewart TG; Downing, Alison; Watkins, Craig A; Marr, Edward J; Nisbet, Alasdair J; Kenyon, Fiona; McNair, Carol; Huntley, John F
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 08/02/2012 EN
Relevância na Pesquisa
26.54%

The effect of Psoroptes ovis infestation on ovine epidermal barrier function

Stoeckli, Miriam R; McNeilly, Tom N; Frew, David; Marr, Edward J; Nisbet, Alasdair J; van den Broek, Adri HM; Burgess, Stewart TG
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
47.25%
Sheep scab is an intensively pruritic, exudative and allergic dermatitis of sheep caused by the ectoparasitic mite Psoroptes ovis. The purpose of the present study was to investigate the effect of P. ovis infestation on different components of the ovine epidermal barrier within the first 24 hours post-infestation (hpi). To achieve this, the expression of epidermal differentiation complex (EDC) genes and epidermal barrier proteins, the nature and severity of epidermal pathology and transepidermal water loss (TEWL) were evaluated.

Two major ruminant acute phase proteins, haptoglobin and serum amyloid A, as serum biomarkers during active sheep scab infestation

Wells, Beth; Innocent, Giles T; Eckersall, Peter D; McCulloch, Eilidh; Nisbet, Alasdair J; Burgess, Stewart TG
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.92%
Two ruminant acute phase proteins (APPs), haptoglobin (Hp) and serum amyloid A (SAA), were evaluated as serum biomarkers (BMs) for sheep scab–a highly contagious ectoparasitic disease caused by the mite Psoroptes ovis, which is a major welfare and production threat worldwide. The levels of both APPs increased in serum following experimental infestation of sheep with P. ovis, becoming statistically significantly elevated from pre-infestation levels at 4 weeks post-infestation. Following successful treatment of infested sheep with an endectocide, Hp and SAA serum levels declined rapidly, with half lives of less than 3 days. In contrast, serum IgG levels which specifically bound the P. ovis-derived diagnostic antigen Pso o 2 had a half-life of 56 days. Taking into account pre-infestation serum levels, rapidity of response to infestation and test sensitivity at the estimated optimum cut-off values, SAA was the more discriminatory marker. These studies illustrated the potential of SAA and Hp to indicate current sheep scab infestation status and to augment the existing Pso o 2 serological assay to give disease-specific indications of both infestation and successful treatment.

Synthesis and Structure-activity Studies on Aliphatic Carbamates and Thiocarbamates Toxic to Scabies Mites, Psoroptes spp. (Acari: Psoroptidae)

Kochansky, J. P.; Wright, F. C.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
Relevância na Pesquisa
27.12%
In laboratory tests, dialkyl carbamates of types ROC(O)NHR′, RSC(O)NHR′, and ROC(S)NHR′ were found to be extremely toxic to Psoroptes spp., including P. ovis (Hering), the common scabies mite of cattle and sheep. Fifty-six compounds of these three types were lethal to P. cuniculi (Delafond) at 0.001 % AI in a tea bag assay. Molecular length, and not the position of the functional group, determined toxicity. Those compounds also tested against P. ovis had approximately equal activity for both species. Testing on rabbits or cattle with scabies showed activity comparable to that of toxaphene, the commercial standard.

Influence of Psoroptes ovis (Hering) (Acari: Psoroptidae) on the Performance of Beef Steers

Cole, N. A.; Guillot, F. S.; Purdy, C. W.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
Relevância na Pesquisa
37.25%
Forty-eight Hereford steers were used to determine the effects of Psoroptes avis (Hering) infestations on weight gain, feed conversion, and feed intake. Calves were randomly assigned to six pens with three pens per treatment. No calves were infected in the control pens, whereas two calves in each of the infested pens were initially exposed to P. ovis mites. The remaining calves in the infested pens became naturally infested by contact with the artificially infested calves. At the end of 94 days, infested calves had lower (P < 0.01) daily gains and lower (P < 0.05) gain-feed ratios than control calves. Feed dry-matter intake was similar in control and infested calves. Regression analysis suggested that P. ovis infestations covering less than 15% of body area did not affect daily weight gains but that infestations covering 30% of body area resulted in a ca. 30% reduction in daily weight gain.

Transcriptomic Analysis of Circulating Leukocytes Reveals Novel Aspects of the Host Systemic Inflammatory Response to Sheep Scab Mites

Burgess, Stewart T. G.; Greer, Andrew; Frew, David; Wells, Beth; Marr, Edward J.; Nisbet, Alasdair J.; Huntley, John F.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 03/08/2012 EN
Relevância na Pesquisa
27%
Infestation of ovine skin with the ectoparasitic mite Psoroptes ovis results in the development of a rapid cutaneous inflammatory response, leading to the crusted skin lesions characteristic of sheep scab. To facilitate the identification of novel diagnostic and therapeutic targets, a better understanding of the host-parasite relationship in sheep scab is essential. Although our knowledge of the host's local cutaneous inflammatory response to sheep scab has increased in recent years, we still know relatively little about the mechanisms of this response at the systemic level. This study used a combined network and pathway analysis of the in vivo transcriptomic response of circulating leukocytes to infestation with P. ovis, during a 6 week period. Network graph analysis identified six temporally-associated gene clusters, which separated into two distinct sub-networks within the graph, representing those genes either up or down-regulated during the time course. Functional and pathway analysis of these clusters identified novel insights into the host systemic response to P. ovis infestation, including roles for the complement system, clotting cascade and fibrinolysis. These analyses also highlighted potential mechanisms by which the systemic immune response to sheep scab can influence local tissue responses via enhanced leukocyte activation and extravasation. By analysing the transcriptomic responses of circulating leukocytes in sheep following infestation with P. ovis...

Comparative immune responses against Psoroptes ovis in two cattle breeds with different susceptibility to mange

Sarre, Charlotte; González-Hernández, Ana; Van Coppernolle, Stefanie; Grit, Rika; Grauwet, Korneel; Van Meulder, Frederik; Chiers, Koen; Van den Broeck, Wim; Geldhof, Peter; Claerebout, Edwin
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
47.33%
The sheep scab mite, Psoroptes ovis, is a major problem in the beef cattle industry, especially in Belgian Blue (BB) cattle. This breed is naturally more predisposed to psoroptic mange but reasons for this high susceptibility remain unknown. Different immune responses could be a potential cause; thus in this study, the cutaneous immune response and in vitro cellular immune response after antigen re-stimulation were examined in naturally infested BB. Cytokine production in the skin and in circulating re-stimulated peripheral blood mononuclear cells (PBMC) demonstrated a mixed pro-inflammatory Th2/Th17 profile, with transcription of IL-4, IL-13, IL-6 and IL-17. Strong IL-17 up-regulation in the skin of BB was associated with an influx of eosinophils and other immune cells, potentially leading towards more severe symptoms. Virtually no changes in cutaneous IFN-γ transcription were detected, while there was substantial IFN-γ up-regulation in re-stimulated PBMC from infested and uninfested animals, potentially indicating a role of this pro-inflammatory cytokine in the innate immune response. In Holstein–Friesian (HF) cattle, generally more resistant to P. ovis infection, a largely similar immunologic response was observed. Differences between HF and BB were the lack of cutaneous IL-17 response in infested HF and low transcription levels of IFN-γ and high IL-10 transcription in re-stimulated PBMC from both infested and uninfested animals. Further research is needed to identify potential cell sources and biological functions for these cytokines and to fully unravel the basis of this different breed susceptibility to P. ovis.

Efficacy of the d-phenothrin/pyriproxyfen association against mites in naturally co-infested rabbits

FERNANDES, Julio Israel; VEROCAI, Guilherme Gomes; RIBEIRO, Francisco de Assis; MELO, Raquel Moreira Pires dos Santos; AZEVEDO, Tha?s Ribeiro Correia; COUMENDOUROS, Katherina; SCOTT, Fabio Barbour
Fonte: Universidade Federal do Pará Publicador: Universidade Federal do Pará
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
47.56%
O objetivo do presente estudo foi avaliar a efic?cia da associa??o de d-fenotrina e piriproxifen no controle de infesta??es simult?neas por Psoroptes ovis, Cheyletiella parasitivorax e Leporacarus gibbus em coelhos naturalmente co-infestados. Vinte coelhos mesti?os (Nova Zel?ndia Branco x Calif?rnia) infestados simultaneamente pelas tr?s esp?cies de ?caros foram divididos aleatoriamente em dois grupos. Todos os coelhos infestados por apresentavam eritema, hiperemia e forma??o de crostas nas orelhas, causados por P. ovis. Infesta??es simult?neas por C. parasitivorax e L. gibbus foram considerados assintom?ticas em todos os animais. Dez animais foram tratados com uma formula??o spray contendo d-fenotrina a 4,4% e piriproxifen a 0,148%, pulverizando toda a superf?cie corporal de forma uniforme, incluindo a face interna das orelhas. Os outros 10 coelhos n?o foram t ratados, sendo mantidos como grupo controle. Os animais foram avaliados nos dias 7, 14, 21, 28 e 35 p?s-tratamento. A associa??o de d-fenotrina e piriproxifen foi 100% eficaz no controle das tr?s esp?cies de ?caros e foi respons?vel pela remiss?o das les?es de sarna psor?ptica nos animais tratados. N?o foram observados sinais de intoxica??o. Os resultados indicam que a formula??o spray de d-fenotrina e piriproxifen em uma ?nica aplica??o ? uma op??o clinicamente segura e eficaz no controle de infesta??es por ?caros em coelhos.; ABSTRACT: The aim of the present study was to evaluate the efficacy of the d-phenothrin/pyriproxyfen association against Psoroptes ovis...