Pathogenicity of Campylobacter jejuni for turkeys and chickens.     

K M Lam  A J DaMassa  T Y Morishita  H L Shivaprasad  A A Bickford 《Avian diseases》1992,36(2):359-363

A Campylobacter jejuni isolate obtained from a turkey liver, designated C101, and a C. jejuni isolate obtained from the feces of a chicken, designated C111, were used to inoculate their respective hosts. Isolate C101 depressed weight gain by 20% when inoculated into newly hatched poults or 4-day-old poults. It also caused death, hepatic necrosis, and generalized hemorrhages in turkey embryos. The chicken-derived isolate, C111, did not reduce weight gain in newly hatched chicks, but it did induce mortality in chicken embryos. The supernatant of the cultures of both C. jejuni isolates also caused mortality in embryos.  相似文献   

The combined effect of fenbendazole treatment and a move to aftermath 7 or 9 weeks after turnout on Dictyocaulus viviparus infections in calves     

M. Eysker  J. H. Boersema  F. N. J. Kooyman  T. J. G. M. Lam 《Veterinary parasitology》1995,60(3-4):339-348

A grazing study was performed with the main objective of examining the effect of fenbendazole (FBZ) in a ‘dose and move’ system on nematode infections in calves with special emphasis on Dictyocaulus viviparus.

Three groups of six calves were grazed from May to October 1993. One group (DM7) was treated with FBZ and moved to aftermath (pasture which had only been mown) 7 weeks after turnout. The second group (DM9) was similarly treated and moved 9 weeks after turnout and the third group served as untreated pasture control group (PC) and was moved to aftermath 9 weeks after turnout.

FBZ treatment removed adult lungworms from DM7 and DM9. Tracer calves grazed during the first 7 or the first 9 weeks after turnout acquired mean burdens of 18 and 125 lungworms, respectively. In PC faecal larval counts increased until the end of August. Most of the animals in this group were then suffering from lungworm disease and emergency treatment with ivermectin was given. In both FBZ-treated groups, larvae reappeared in the faeces of some of the calves 4–5 weeks after treatment. Subsequent reinfection resulted in higher mean faecal larval counts in both groups 2 months after treatment, although variation in faecal larval counts was high. In DM7 values tended to be higher than in DM9. These higher larval counts were associated with mild signs of parasitic bronchitis in some calves of DM7, whereas no signs were seen in DM9.

At the end of the experiment, all calves, and also a group of six permanently housed non-infected control calves (HC), were infected experimentally with 5000 D. viviparus larvae to evaluate development of immunity. The worm counts at necropsy showed that all calves on pasture had developed immunity.  相似文献   

Recovery of brodifacoum in vomitus following induction of emesis in dogs that had ingested rodenticide bait     

KH Parton  EK Willson  MG Collett  LH Booth 《New Zealand veterinary journal》2018,66(1):41-43

AIM: To assess the benefit of inducing emesis in dogs that have ingested rodenticide bait containing brodifacoum (BDF), by determining the amount of BDF in bait recovered from the vomitus relative to the estimated amount consumed.

METHODS: Between 2014 and 2015 samples of vomitus from seven dogs that ingested rodenticide baits containing BDF were submitted by veterinarians in New Zealand. All seven dogs had been given apomorphine by the veterinarian and vomited within 1 hour of ingesting the bait. Some or all of the bait particles were retrieved from each sample and were analysed for concentrations of BDF using HPLC. Based on estimations of the mass of bait consumed, the concentration of BDF stated on the product label, and the estimated mass of bait in the vomitus of each dog, the amount of BDF in the vomited bait was calculated as a percentage of the amount ingested.

RESULTS: For five dogs an estimation of the mass of bait ingested was provided by the submitting veterinarian. For these dogs the estimated percentage of BDF in the bait retrieved from the vomitus was between 10–77%. All dogs were well after discharge but only one dog returned for further testing. This dog had a normal prothrombin time 3 days after ingestion.

CONCLUSIONS AND CLINICAL RELEVANCE: The induction of emesis within 1 hour of ingestion can be a useful tool in reducing the exposure of dogs to a toxic dose of BDF. The BDF was not fully absorbed within 1 hour of ingestion suggesting that the early induction of emesis can remove bait containing BDF before it can be fully absorbed.  相似文献   

An unresponsive progressive pustular and crusting dermatitis with acantholysis in nine cats          下载免费PDF全文

Catherine A. Outerbridge  Verena K. Affolter  Leslie A. Lyons  Samantha L. Crothers  Andrea T. H. Lam  Terri E. Bonenberger  Stephen D. White 《Veterinary dermatology》2018,29(1):81-e33

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Cutaneous lymphoma in a Dachshund     

Andrea Lam 《The Canadian veterinary journal. La revue veterinaire canadienne》2021,62(7):771

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TRUNCATION ARTIFACT IN MAGNETIC RESONANCE IMAGES OF THE CANINE SPINAL CORD          下载免费PDF全文

Tommaso Gregori  Richard Lam  Simon L. Priestnall  Christopher R. Lamb 《Veterinary radiology & ultrasound》2016,57(6):582-586

The truncation artifact in magnetic resonance (MR) images is a line of abnormal signal intensity that occurs parallel to an interface between tissues of markedly different signal intensity. In order to demonstrate the truncation artifact in sagittal images of the canine spinal cord and the effect of changing spatial resolution, we conducted an experimental in vitro study. A section of fixed canine spinal cord was imaged using a 1.5T magnet. Spatial resolution was increased by increasing the acquisition matrix and reconstruction matrix, producing series of T2‐weighted (T2w) images with the following pixel sizes: A, 1.6 (vertical) × 2.2 mm² (horizontal); B, 1.2 × 1.7 mm²; C, 0.8 × 1.1 mm²; D, 0.4 × 0. 6 mm². Plots of mean pixel value across the cord showed variations in signal intensity compatible with truncation artifact, which appeared as a single, wide central hyperintense zone in low‐resolution images and as multiple narrower zones in high spatial resolution images. Even in images obtained using the highest spatial resolution available for the MR system, the edge of the spinal cord was not accurately defined and the central canal was not visible. The experiment was repeated using an unfixed spinal cord specimen with focal compression applied to mimic a pathologic lesion. Slight hyperintensity was observed within the spinal cord at the site of compression although the cord was normal histologically. Results of this study suggest that caution should be applied when interpreting hyperintensity affecting the spinal cord in T2w sagittal images of clinical patients because of the possibility that the abnormal signal could represent a truncation artifact.  相似文献   

Development and characterization of a technique for percutaneous radiologic gastrojejunostomy tube placement in the dog          下载免费PDF全文

Rebekah M. Mack DVM  DACVIM  Benjamin Staiger DVM  Daniel K. Langlois DVM  DACVIM  Stephen J. Mehler DVM  DACVS  Nathaniel Lam DVM  DACVS  Trevor Moore DVM  DACVIM  Andrew Brown DVM  DACVECC  DECVECC  Matthew W. Beal DVM  DACVECC 《Journal of Veterinary Emergency and Critical Care》2016,26(5):646-653

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Convergence‐Retraction Nystagmus Associated with Dorsal Midbrain Lesions in Three Dogs          下载免费PDF全文

A.H. Crawford  E. Beltran  R. Lam  P.J. Kenny 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2016,30(4):1229-1234

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Descriptive analysis of retirement of Thoroughbred racehorses due to tendon injuries at the Hong Kong Jockey Club (1992-2004)     

Lam KH  Parkin TD  Riggs CM  Morgan KL 《Equine veterinary journal》2007,39(2):143-148

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A radioimmunoassay for the detection of antibodies to Mycoplasma gallisepticum     

K Karaca  K M Lam 《Avian diseases》1986,30(3):628-631

A radioimmunoassay technique was developed to determine the antibodies to Mycoplasma gallisepticum (MG) in sera, yolk fluids, and tracheal washings.  相似文献