Influence of adjuvant formulation on the induced protection of mice immunized with total soluble antigen of Trichinella spiralis   总被引：1，自引：0，他引：1  

Deville S  Pooter Ad  Aucouturier J  Lainé-Prade V  Cote M  Boireau P  Vallée I 《Veterinary parasitology》2005,132(1-2):75-80

Vaccination of pigs against the helminth nematode Trichinella could be a good alternative to prevent the risk of human infection. In order to develop an efficient and safe vaccine, the choice of the adjuvant is an important issue. In this study, two adjuvants were selected to prepare vaccines based on total soluble Trichinella spiralis muscle larvae (ML) antigen: Montanide ISA 70 water in oil emulsion and Montanide IMS nanoparticles. Aluminium hydroxide was used as a reference adjuvant. The immune response was checked by ELISA of parasite antigen specific IgG1 and IgE. Finally, protection induced in vaccinated mice was measured after a T. spiralis challenge by counting ML burdens. The results clearly showed an impact of adjuvants on the specific IgG1 and IgE antibody responses against T. spiralis. Differences were observed between the rates of protection induced according to the type of formulation, although the three adjuvants tested were able to enhance the humoral immune response. This work demonstrated the need to use an adjuvant to obtain a specific IgG1 and IgE responses directed against the total soluble extract of T. spiralis.  相似文献   

Simple species identification of Trichinella isolates by amplification and sequencing of the 5S ribosomal DNA intergenic spacer region   总被引：4，自引：0，他引：4  

De Bruyne A  Yera H  Le Guerhier F  Boireau P  Dupouy-Camet J 《Veterinary parasitology》2005,132(1-2):57-61

We developed a PCR-based assay using a single primer pair to amplify the 5S ribosomal DNA intergenic spacer region to identify Trichinella isolates. In our method, amplified products are directly sequenced on both strands and compared to GenBank sequences. Using this method, we were able to identify Trichinella spiralis, T. britovi and T. nativa. This method permits rapid species identification of Trichinella isolates; however, further evaluation is required before recommending this approach for routine use.  相似文献   

Bronchodilators in bronchoscopy-induced airflow limitation in allergen-sensitized cats     

Kirschvink N  Leemans J  Delvaux F  Snaps F  Clercx C  Gustin P 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2005,19(2):161-167

This study investigated the effect of bronchoscopy and bronchoalveolar lavage (BAL) on respiratory function, determined by barometric whole-body plethysmography (BWBP), of healthy and allergen-sensitized cats. Furthermore, the efficacy of inhaled bronchodilators in preventing changes in respiratory function was determined. For test 1, 18 healthy experimental cats were investigated on day 1 by BWBP. On day 2, the cats underwent BWBP after sedation (medetomidine), after anesthesia induction (propofol), and after bronchoscopy and BAL. Enhanced pause (Penh) was significantly increased after bronchoscopy and BAL (1.64 +/- 0.17 versus 1.23 +/- 0.07, P < .05). For test 2, 6 cats were sensitized to ovalbumin (OVA), 6 cats were sensitized to Ascaris suum (AS), and 6 cats served as controls. On day 0, OVA- and AS-sensitized cats underwent an inhaled allergen challenge, whereas controls were exposed to saline. On days 1 and 2, the same protocol as described for test 1 was repeated. Post-BAL Penh of the AS-sensitized cats was significantly higher than at test 1 (2.28 +/- 0.22 versus 1.69 +/- 0.33, P < .05) and was correlated with BAL fluid neutrophil count (r = 0.55, P < .05). During tests 3, 4, and 5, the same protocol as used for test 2 was applied to each cat group, with the animals being randomly treated before sedation with inhaled salbutamol (200 microg), ipratropium bromide (40 microg), or a combination of both (200 + 40 microg). Post-BAL Penh of the AS-sensitized group was significantly decreased after the salbutamol + ipratropium bromide treatment (1.56 +/- 0.18 versus 2.28 +/- 0.22, P < .05). This study suggests that bronchoscopy and BAL induce airflow limitation in cats, which is more severe in the presence of lower airway inflammation. Inhaled salbutamol + ipratropium bromide reduce BAL-induced bronchoconstriction in AS-challenged cats and might be recommended as preventive treatment of asthmatic cats undergoing bronchoscopy.  相似文献   

Lack of evidence of Brucella ovis infection in rams in Quebec          下载免费PDF全文

Arsenault J  Girard C  Dubreuil P  Bélanger D 《The Canadian veterinary journal. La revue veterinaire canadienne》2004,45(4):312-314

A study was conducted to estimate the seroprevalence of Brucella ovis infection in rams in the Estrie and Bas-Saint-Laurent regions (Quebec). Rams sera (n = 258) were serologically evaluated from 224 rams in 30 commercial flocks and from 34 rams at 2 slaughterhouses by using an enzyme linked immunosorbent assay. Epididymides and testes were examined by palpation on farms and microscopically for culled rams. No ram was seropositive to Brucella ovis or had lesions suggestive of brucellosis from the farm or slaughterhouse surveys.  相似文献   

The complement in milk and defense of the bovine mammary gland against infections   总被引：1，自引：0，他引：1  

Rainard P 《Veterinary research》2003,34(5):647-670

The mammary gland of dairy cows, which is prone to infection by various bacteria, mobilizes local and systemic immune defenses to cope with pathogens. The complement system plays an important part in the innate immunity against microorganisms through its bactericidal, opsonic, and phlogistic functions. The amount of the complement in the milk of healthy glands of dairy cows is low. Moreover, the classical pathway of activation is not functional because of a shortage in C1q. By contrast, the alternative pathway is active, deposits C3b and C3bi on bacteria, and generates amounts of C5a which are highly variable among cows. A slight inhibition of the bactericidal/hemolytic activities, of the deposition of C1q on bacteria, and of the phlogistic activity of C5a makes milk a rather anti-inflammatory fluid. The inhibitory activity does not involve C3b/ C3bi deposition on bacteria, nor the generation of C5a by the alternative pathway. When inflammation develops, the blood-derived complement components overcome the inhibitions and complement-dependent bactericidal, opsonic and phlogistic activities may be high in milk. Further research is necessary to evaluate the contribution of C5a to the recruitment of leukocytes in the mammary gland, and to specify the links between the complement system and the response of resident cells (leukocytes and mammary epithelial cells) to infection stimulus. This will help to define the contribution of the complement system to resistance against mastitis, and could help to differentiate animals more or less resistant to this frequent and costly disease.  相似文献   

Factors influencing the development of jugular thrombophlebitis in cattle and comparison of 2 types of catheter          下载免费PDF全文

Rouleau G  Babkine M  Dubreuil P 《The Canadian veterinary journal. La revue veterinaire canadienne》2003,44(5):399-404

Two studies were conducted to evaluate the factors associated with the development of thrombophlebitis in cattle following intravenous catheterization of the jugular vein. In study 1, 20 healthy animals were catheterized with 2 different types of catheter (polytetrafluoroethylene (PTE) versus polyvinylchloride (PVC)) for a period of 120 hours. In study 2, 50 dairy cows referred for treatment to the Large Animal Veterinary Teaching Hospital at the University of Montreal were catheterized with a commercial PTE catheter, using a standardized technique, for a period varying from 3 to 6 days, and inherent risk factors were evaluated. A clinical and echographical evaluation of the 2 groups in study 1 demonstrated a higher frequency of thrombosis in the PTE group than in the PVC group. In study 2, the primary factors associated with the development of thrombophlebitis in sick cows were the experience of the manipulator and the severity of the disease.  相似文献   

Randomized controlled trial of the efficacy of cyclosporine in the treatment of atopic dermatitis in dogs     

Olivry T  Steffan J  Fisch RD  Prélaud P  Guaguère E  Fontaine J  Carlotti DN;European Veterinary Dermatology Cyclosporine Group 《Journal of the American Veterinary Medical Association》2002,221(3):370-377

OBJECTIVE: To evaluate efficacy of cyclosporine A, administered at either of 2 dosages, in dogs with atopic dermatitis (AD). DESIGN: Multicenter randomized controlled trial. ANIMALS: 91 dogs with AD. PROCEDURE: Dogs were assigned to receive placebo (30 dogs), cyclosporine at a low dosage (2.5 mg/kg [1.1 mg/lb], PO, q 24 h for 6 weeks; 30 dogs), or cyclosporine at a high dosage (5.0 mg/kg [2.3 mg/lb], PO, q 24 h for 6 weeks; 31 dogs). RESULTS: After 6 weeks, mean percentage reductions, compared with baseline scores, in scores of lesion severity were 34, 41, and 67% for dogs treated with the placebo, cyclosporine at the low dosage, and cyclosporine at the high dosage, respectively. Similarly, mean percentage reductions in pruritus scores were 15, 31, and 45%, respectively. Percentage reductions in skin lesion and pruritus scores were significantly higher for dogs given cyclosporine at the high dosage than for dogs given the placebo. Treatment efficacy was significantly associated with whether dogs had a history of seasonal AD. Percentage reductions in skin lesion and pruritus scores were high for dogs treated with cyclosporine at the highest dosage that had a history of nonseasonal AD. Dogs in all groups with seasonal AD improved during the study period. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that oral administration of cyclosporine at a dosage of 5.0 mg/kg once daily is effective in reducing severity of pruritus and skin lesions in dogs with AD, especially those with nonseasonal disease.  相似文献   

Fire blight risk assessment during bloom in an experimental orchard using BIS (Billing's Integrated System)     

Pascal Lecomte  Jean-Pierre Paulin  Eve Billing 《European journal of plant pathology / European Foundation for Plant Pathology》1998,104(7):667-675

The value of BIS for blossom blight risk assessment was studied from data collected in an experimental orchard in south-west France. Trees observed included mature commercial pear and apple trees and some young trees in experimental plots. There was a weather station in the orchard and beehives were present. Field records included flowering times of the pear and apple cultivars studied (mostly Passe-Crassane and Beurré Hardy, Royal Gala and Golden Delicious) and dates when blossom blight was first seen on each cultivar. Between 1980 and 1991, records of blight were available for 25 cases. In most cases, one or more infection risk (IR) days, as defined for BIS, could be found during bloom. DD13 mean sums (sums of degree days above a mean temperature of 13 °C) gave good guidance on times when early signs of blossom blight were present in 14 cases. There was only a slight divergence from BIS guides in a further five cases. Possible reasons for divergence and for non-fit in the remaining six cases are discussed. It is concluded from this study that BIS should give useful guidance on optimal times for protective spray applications and for timing of searches for signs of early blossom blight in south-west of France. Graphical presentations of data provide additional information.  相似文献   

Estimating effective population size of large marine populations,is it feasible?     

Florianne Marandel  Pascal Lorance  Olivier Berthel  Verena M. Trenkel  Robin S. Waples  Jean‐Baptiste Lamy 《Fish and Fisheries》2019,20(1):189-198

Sustainable exploitation of marine populations is a challenging task relying on information about their current and past abundance. Fisheries‐related data can be scarce and unreliable making them unsuitable for quantitative modelling. One fishery independent method that has attracted attention in this context consists in estimating the effective population size (N_e), a concept founded in population genetics. We reviewed recent empirical studies on N_e and carried out a simulation study to evaluate the feasibility of estimating N_e in large fish populations with the currently available methods. The detailed review of 26 studies found that published empirical N_e values were very similar despite differences in species and total population sizes (N). Genetic simulations for an age‐structured fish population were carried out for a range of population and samples sizes, and N_e was estimated using the Linkage Disequilibrium method. The results showed that already for medium‐sized populations (1 million individuals) and common sample sizes (50 individuals), negative estimates were likely to occur which for real applications is commonly interpreted as indicating very large (infinite) N_e. Moreover, on average, N_e estimates were negatively biased. The simulations further indicated that around 1% of the total number of individuals might have to be sampled to ensure sufficiently precise estimates of N_e. For large marine populations, this implies rather large samples (several thousands to millions of individuals). If however such large samples were to be collected, many more population parameters than only N_e could be estimated.  相似文献   

Aclonifen targets solanesyl diphosphate synthase,representing a novel mode of action for herbicides     

Sabine Kahlau  Florian Schrder  Jrg Freigang  Bernd Laber  Gudrun Lange  Daniel Passon  Sabrina Kleeßen  Marc Lohse  Arno Schulz  Pascal von Koskull‐Dring  Sebastian Klie  Sascha Gille 《Pest management science》2020,76(10):3377-3388

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