Gill diseases of cultured salmonids in Ontario.

Between 1977 and 1981, the Fish Pathology Laboratory of the Ontario Veterinary College received 239 cases from trout farms of southern Ontario, 51 (21.3%) of which had diseased gills. Branchial lesions in 86.3% of these 51 cases were characterized by marked lamellar epithelial hyperplasia with epithelial hypertrophy and lamellar fusion. Filamentous bacteria were seen on the surface of the branchial filaments and lamellae in 68.6% of the cases. Our observations highlight the importance of gill diseases as a production problem of farmed salmonids in southern Ontario.     

Methicillin-resistant staphylococcal colonization in dogs entering a veterinary teaching hospital

Nasal, axillary and rectal swabs were collected from 193 dogs admitted to the Ontario Veterinary College Veterinary Teaching Hospital. Enrichment culture was performed and coagulase positive staphylococci were identified via standard methods. Methicillin-resistant Staphylococcus pseudintermedius was isolated from 4/193 (2.1%) dogs, and methicillin-resistant Staphylococcus aureus and methicillin-resistant Staphylococcus schleiferi subsp. coagulans were each isolated from 1/193 (0.5%) dogs. Methicillin-resistant Staphylococcus intermedius was not identified. All S. pseudintermedius isolates were unrelated on pulsed-field gel electrophoresis. Evaluation of the epidemiology of methicillin-resistant staphylococcal colonization is necessary to understand the apparent emergence of these strains and to develop appropriate control strategies.     

Ovarian Disorders: Clinical and Morphological Observations in 30 Mares

A five year prospective study of equine ovarian problems requiring surgical correction was undertaken at the Ontario Veterinary College. Thirty mares were studied, of which 14 had granulosa cell tumors, six were with anovulatory persistent follicular “structures”, five had ovarian hemotoma, two presented ovarian hypoplasia and one each of ovarian dysgerminoma, teratoma and abscessation. The clinical signs manifested by the affected animals were varied. The affected ovaries were removed via flank or midline laparotomy or through colpotomy. Their morphology was studied and representative portions of affected ovaries submitted for laboratory diagnosis. Postsurgical recovery and resumption of reproductive activity were satisfactory.     

Demographics and career path choices of graduates from three Canadian veterinary colleges

The classes of 2007 from the Atlantic Veterinary College, Ontario Veterinary College, and Western College of Veterinary Medicine were surveyed to determine what factors influenced the respondents’ career path choices. Seventy percent (166/237) of those contacted participated in the survey of which 89.1% were female, 62.7% had an urban upbringing, and 33.0% expected to be employed in a small center (population ≤ 10 000). Half (52.5%) of the respondents reported that they were interested in mixed or food animal practice at the time of entry into veterinary college, but this proportion declined to 34.2% by the time of graduation. Three factors were significantly associated with choosing a career in mixed or food animal practice: having been raised in a small center, being a male, and having a good to excellent knowledge of food animal production at the time of entry into veterinary college, as determined by a self-assessment.     

The seroprevalence of canine parvovirus-2 in a selected sample of the canine population in ontario

Canine sera, collected from dogs presented to the Ontario Veterinary College between 1976 and 1980, were assessed for canine parvovirus-2 antibody using a microtitre hemagglutination-inhibition test. Special emphasis was made on the period from September 1979 to October 1980 (2892 samples). No antibody was detected in samples collected in 1976 or 1977. The first positive sera were obtained in January 1978. By the end of 1978 antibodies to canine parvovirus-2 were widespread in Ontario dogs and in 1980, 683 of 2191 dogs (31.2%) had antibody. This was before widespread vaccination was being practised and indicates canine parvovirus-2 infection occurred frequently. Evaluation of clinical records of these dogs suggested that most infections had been subclinical.     

The management of anal furunculosis

The literature on anal furunculosis is reviewed. Twenty–eight dogs affected with this condition were admitted to the clinics of the Royal Veterinary College, London, and the Ontario Veterinary College. They were treated by debridement, cauterization, and sac resection, steroid–antibiotic cream, and in a few cases, by cryosurgery. The favourable results obtained indicate that this is a better method of treatment than others so far described. Résumé. On a révisé les articles sur la furonculose. Vingt-huit chiens souffrant de cette condition ont été admis aux cliniques du Collège Royal Vétérinaire de Londres et à celles du Collège Vétérinaire de l'Ontario. Ils ont été traités par débridement, cautérisation, résection du sac anal, crème stéroïde antibiotique, et dans quelques cas par cryochirurgie. Les résultats obtenus indiquent que cette méthode de traitement est meilleure que d'autres décrites jusqu'ici. Zusammenfassung. Die Literatur iiber Furunkulose wurde nochmals gepriift. Achtundzwanzig Hunde die von diesem Leiden betroffen waren, wurden in die Kliniken der Royal Veterinary Collège, London und der Ontario Veterinary Collage eingeliefert. Sie wurden mit Débridement, Kauterisation, Resektion des Aftersacks, antibiotischer Steroid Crème und in einigen Fàllen durch Kryochirurgie behandelt. Die guten Resultate die man erzielte, deuten an, dass dièses eine bessere Behandlungsmethode ist als andere, die bisher beschrieben waren.     

Antimicrobial drug susceptibility of bacteria isolated from disease processes in cattle, horses, dogs and cats

Results are presented of antimicrobial disc diffusion susceptibility testing on commonly isolated bacterial pathogens made at the Ontario Veterinary College Diagnostic Bacteriology Laboratory in 1981 and 1982. Nearly 2 000 isolates from horses, cattle, dogs and cats were tested. Comparison of resistance in the same bacterial species isolated from different animal species showed significant differences between some of the same antibiotics.     

Colic in a Mare Caused by a Colonic Neurofibroma

A 16 year old Thoroughbred mare was presented to the Ontario Veterinary College because of an acute episode of colic. An exploratory laparotomy was performed and a neurofibroma was identified and successfully removed from the small colon. The clinical and pathological features of this case are discussed.     

West Nile virus encephalomyelitis in horses in Ontario: 28 cases

West Nile virus encephalomyelitis was diagnosed in 28 horses presented to the Ontario Veterinary College Veterinary Teaching Hospital between August 20 and October 15, 2002. The age range of affected horses was 5 months to 20 years (mean 6.9 years, median 6 years). Clinical signs were highly variable. Duration of hospitalization ranged from < 1 to 12 days (mean 5 days, median 5.4 days). Overall, 16 of the 28 (57%) horses were discharged and, of the 14 from which follow-up information was available, 13 (93%) were reported to be clinically normal 4 to 6 weeks following discharge, while the other horse had markedly improved. This pathogen is emerging as an important cause of neurological disease in Canada.     

Epidemiology of Equine Protozoal Myeloencephalitis in North America Based on Histologically Confirmed Cases

Following a workshop on equine protozoal myeloencephalitis (EPM) convened at the Veterinary Medical Forum of the American College of Veterinary Internal Medicine in 1988, this survey of EPM in North America was developed. It is based upon 364 histologically confirmed case records from California, Florida, Illinois, Kentucky, New York, Ohio, Oklahoma, Ontario, Pennsylvania, and Texas up to 1988. The highest rate of infection was found in young Thoroughbred, Standardbred, and quarter horses. Differences in geographic location, sex, and month (season) of infection were not discernible. This report, the first comprehensive survey of EPM in North America, is intended to serve as a basis for evaluating future changes in prevalence and spread of EPM.     

Comparison of three different methods of total carbon dioxide measurement

The objective of this study was to compare total carbon dioxide (TCO(2)) levels measured by three different methods. Two hundred jugular venous blood samples from dogs admitted to the Veterinary Teaching Hospital, Ontario Veterinary College with various clinical disorders were analyzed by the Radiometer blood gas analyzer (BGA) and the Coulter DACOS analyzer. In 70 of these samples, TCO(2) was also measured by the Kodak Ektachem DTE chemistry analyzer. Comparison of the agreement between methods revealed intraclass correlation coefficients (ICC) of 0.63, 0.79, and 0.82 for the DACOS-Ektachem, DACOS-BGA and Ektachem-BGA comparisons, respectively. Evaluation of the effect of storage time on TCO(2) content of stored serum samples measured on the DACOS analyzer revealed a decrease of almost 2 mmol/L and a decrease in the intraclass correlation coefficient values between the DACOS analyzer and other methods after 7 hours storage time. The results of this observational study revealed lower agreement between the three methods in this study than previously reported between other methods of TCO(2) measurement. Possible reasons for the lower than expected agreement in this study included changes in DACOS values because of storage and differences in methodologies between the methods.     

Atrioventricular muscular dystrophy in a 5-month-old English springer spaniel

Primary persistent atrial standstill due to atrioventricular muscle dystrophy is a rare familial disease in dogs. The diagnosis of this disorder in a 5-month-old English springer spaniel is the earliest in dogs that have been presented at the Ontario Veterinary College.     

Chronic abscesses in cats associated with an organism resembling Mycoplasma

Three cats were admitted to the Ontario Veterinary College with chronic nonhealing abscesses which had not responded to a variety of local and systemic treatments.

Smears made from the purulent exudate and stained with Wright's, Giemsa's and Gram's stains did not reveal the presence of any bacteria, yeast or fungal hyphae. Bacteria could not be cultured aerobically or anaerobically but organisms resembling mycoplasmas were cultured in two cases. All cats responded to tetracycline therapy.

     

Isolation of methicillin-resistant Staphylococcus aureus from the environment in a veterinary teaching hospital

After recognition of a cluster of methicillin-resistant Staphylococcus aureus (MRSA) infection in horses and humans at the Ontario Veterinary College Veterinary Teaching Hospital, environmental contamination with MRSA was evaluated. A total of 260 environmental surfaces were sampled during periods when MRSA-infected horses were hospitalized, and MRSA was isolated from 25/260 sites (9.6%). The most commonly contaminated sites were stalls housing MRSA-positive horses, but other stalls, medical equipment, personal items, and equine restraint devices also were contaminated. The role of the environment in the transmission of MRSA infection to horses or humans is unclear. However, relatively widespread contamination of the hospital environment, as apparently occurs when infected horses are hospitalized, suggests that the environment may be an important source of MRSA infection. This possibility must be taken into consideration when designing infection control and disinfection protocols.     

Corynebacterium equi Infections in Horses, 1958-1984: A Review of 131 Cases

Of 131 cases of Corynebacterium equi infection in horses submitted for necropsy to the Ontario Veterinary College or Veterinary Laboratory Services, OMAF, Guelph, Ontario from 1958 to 1984, 115 were diagnosed as suppurative pneumonia, and of these 55 had associated ulcerative enterocolitis. Only five animals had intestinal involvement without pulmonary lesions. The remaining 11 cases included arthritis/cellulitis, skin abscesses and submandibular lymphadenitis. While the lung, intestine and associated lymph nodes yielded C. equi most frequently, in 21% of cases C. equi was also cultured from parenchymatous organs (spleen, liver or kidney) or blood. Corynebacterium equi infection accounted for 10% of all foals submitted for postmortem examination and 45% of all foals with pneumonia. Affected foals were one to four months of age. Submissions occurred between the months of May and August with a peak during July. There was a significantly greater prevalence of C. equi infection in Standardbreds when compared with other breeds. Of foals in this study, 36% were from farms which had had other horses succumb to this disease. Of the foals with pulmonary involvement, 21% did not have fever or clinical signs referable to the respiratory or gastrointestinal systems, findings which indicated that a large percentage of cases were subclinical.     

Retrospective evaluation of xylazine/halothane anesthesia in 125 cattle

A retrospective morbidity and mortality study was carried out on 125 case records of cattle involving xylazine/halothane anesthesia at the Ontario Veterinary College, Guelph between May 1979 and February 1983.     

Total hemolytic complement values in normal and diseased dog populations

The optimum conditions for handling and storage of canine sera for total hemolytic complement assays were assessed. Sera from 113 normal dogs and 217 clinical admissions to the University of Pennsylvania Veterinary Hospital were assayed for total hemolytic complement levels. Normal sera had a mean value of 185 CH50 units. Sera from animals with systemic lupus erythematosus and hemorrhagic gastroenteritis, had significantly lower mean levels of complement than the normal group. Sera from dogs with generalized demodectic mange, tumors, various inflammatory diseases, hypothyroidism, seborrhea, and rheumatoid arthritis had values significantly higher than the normal population.     

Implementation and use of a microcomputer-based management information system to monitor dairy herd performance

A microcomputer-based herd management information system was implemented as part of the herd health program provided to 13 dairy clients by the Ontario Veterinary College, University of Guelph. The study was conducted over a two year period. Data were collected from on-farm event diaries, veterinary visit reports, and production testing information. Selected indices of reproduction, udder health, production, and heifer performance were reported. It was concluded that the implementation of a microcomputer-based information management system, operated as a bureau service, was feasible. However, limitations to the implementation in veterinary practice were identified.     

The Prognostic Significance of Angiogenesis in Canine Mammary Tumors

The purpose of the study was to determine if neovascularization, a measure of angiogenesis, is correlated with metastasis of mammary tumors in dogs. Forty-six paraffin-embedded tissue blocks of benign and malignant canine mammary tumors obtained from 42 clinical cases at the Iowa State University Veterinary Teaching Hospital were retrieved from the archives of the Department of Veterinary Pathology. Of the dogs with malignant tumors, cases with and without lymph node metastasis were chosen. Neovascularization was quantified by light microscopy on formalin-fixed, paraffin-embedded sections of canine mammary tumors using an avidin biotin immunoperoxidase assay for factor VIII-related antigen. Mean microvessel counts for each group were statistically evaluated using analysis of variance. The mean number of microvessels was highest in the malignant tumors of dogs with lymph node metastasis (44). This number was significantly different from the mean number of microvessels in the benign tumors (28; P = .03) and a trend occurred toward higher microvessel counts in malignant tumors with lymph node metastasis versus malignant tumors of dogs without metastasis (32; P = .1). No significant difference was found between the number of microvessels found in malignant tumors without metastasis versus benign tumors. The trend toward higher microvessel counts in mammary tumors that have metastasized supports the premise that angiogenesis may be an independent and significant prognostic indicator in dogs with malignant mammary tumors, as it is in women with breast cancer.     

Using focus groups to engage veterinary students in course redesign and development

Students' perceptions about the quality of teaching have been shown to influence their approaches to learning and studying. The literature suggests that understanding student perceptions is critical to making informed decisions about curriculum development so that courses meet objectives, enhance engagement, and, ultimately, improve learning. However, the assessment of students' perceptions of their courses and the quality of teaching is frequently limited to an end-of-term course evaluation survey. While these course evaluations may be useful in providing a summative assessment, they do not typically provide insight into the reasons and influences that underlie student ratings. Achieving this type of understanding can be accomplished through qualitative methodology, which is a process of investigation used to reveal the depth, complexity, and nuances of perceptions and experiences. In the current article, we report the use of focus groups as a method of gaining in-depth understanding of student perceptions for course redesign. We present the redesign of the Art of Veterinary Medicine II course, a second-year core offering within the Doctor of Veterinary Medicine curriculum at the Ontario Veterinary College in Guelph, Canada. A series of student focus groups were held to gain greater insight into student perceptions of the course objectives, format, and content. Findings were then considered in the redevelopment of the course to better engage students and their various learning styles. Summative course evaluations as well as informal feedback before and after the focus groups indicate a notable improvement in student experiences and perceptions of the course format and content following the focus-group informed course redesign.