NEURONOPHAGIA IN THE COELIACO-MESENTERIC GANGLIA OF HORSES AFFECTED WITH GRASS SICKNESS.
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Between July 1, 1983 and December 31, 1990, risk factors were determined for all horses with joint disease presented to a referral center, of being discharged, of ever becoming sound, or of being alive at 3 mo follow-up. Logistic multiple-regression models were done separately for foals (< or = 4 mo), yearlings (> 4-24 mo) and racing or nonracing adult horses (> 24 mo). The breakdown in this study was 53 foals, 87 yearlings, 141 nonracing adults, and 226 racing adults. Thirty-one foals (58%), 68 yearlings (78%), 119 non-racing adults (84%), and 213 racing adults (94%) were discharged. Foals with a less severe lameness, duration of illness of > 1 d, and infectious arthritis had increased odds of discharge. At follow-up, 12 of 18 (67%) were alive, 10 (56%) of which were sound. Yearlings with osteochondrosis had higher odds of discharge; at follow-up, 38 of 49 (78%) were alive, 32 (65%) of which were sound. For non-racing adults, horses with less severe lameness, without a miscellaneous diagnosis, or intended for pleasure use had increased odds of discharge. At follow-up, 55 of 78 (70%) were alive and 33 of 58 (57%) with soundness data became sound. Risk factors for higher odds of being alive at follow-up were carpal lameness, arthroscopic surgery, a prognosis other than poor, became sound, above-median hospitalization costs, and duration of follow-up. The 161 racing adults (76% of discharges), with follow-up, were more likely to have had osteoarthritis, higher hospital costs, hospitalization > 1 d, and arthroscopy. Sixty-four (60%) of these became sound; the odds increased if the horse was not severely lame at admission or was hospitalized for > 1 d. Risk factors and prognosis differed by age-use group among horses seen at our hospital.
In place of mice, monkey kidney stable (MS) cell cultures were used successfully in serologic studies of African horse-sickness virus.The maintenance medium containing 2% serum was chosen as the virus diluent. Maximum neutralization occurred after 1-hour incubation at 37 C., and maintained the same titer during an additional 4-hour incubation period. No significant difference was observed between neutralization titers titrated using the same antiserum mixed with two different passage levels of virus. Rabbit and guinea pig antiserums prepared using virus grown in MS cell cultures had antibody titer as high as those prepared in the same manner using mouse brain suspension. African horse-sickness virus strains isolated in Asia were serologically identified using a standard neutralization technique in tissue culture. All the strains were closely related to each other and all had antigenic similarity to Type 6 virus (strain 114).
OBJECTIVE: To determine whether keratan sulfate concentrations in plasma or synovial fluid from clinically normal horses were different from concentrations in horses with joint disease and whether concentrations varied with type of joint disease. DESIGN: Case-control study. ANIMALS: 67 clinically normal horses, 10 clinically normal foals, and 160 horses with joint disease. PROCEDURE: ELISA was used to measure keratan sulfate concentrations. RESULTS: Mean plasma keratan sulfate concentration (mean +/- SEM, 580 +/- 124 ng/ml) in foals peaked at 10 weeks of age. Mean plasma keratan sulfate concentration in clinically normal horses was 200 ng/ml (95% confidence interval, 157 to 251 ng/ml). Horses with osteochondral (chip) fractures, other closed intraarticular fractures, inflammatory arthritis (synovitis), infectious arthritis, or osteochondrosis had significantly higher plasma keratan sulfate concentrations than did clinically normal horses, but horses with osteoarthritis did not. Breed, gender, and type of joint disease affected keratan sulfate concentration in synovial fluid. Standard-breds with chip fractures of the metacarpophalangeal/ metatarsophalangeal joints had significantly higher keratan sulfate concentrations in synovial fluid than did Thoroughbreds. Keratan sulfate concentrations in synovial fluid from osteoarthritic carpal joints were lower than concentrations in normal carpal joints and tarsocrural joints with inflammatory joint disease. CLINICAL IMPLICATIONS: Keratan sulfate concentration alone was not a specific marker of joint disease but was affected by various joint diseases.
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The prepurchase examination is performed to aid a prospective purchaser in determining the suitability of a specific patient for an anticipated use and, perhaps, an intended rider. The ophthalmic portion of that examination can be performed satisfactorily with minimal equipment by following a systematic protocol that includes examination of all segments of the globe and an evaluation of the patient's vision. Findings of the examination should be discussed with and made in writing to the buyer so that he or she can make an informed decision about the suitability of the purchase.
This article is intended to provide the practitioner with a succinct but complete source regarding equine orbital and ocular anatomy,instrumentation available for ophthalmic examination, a methodical examination technique, sedation and regional nerve blocks, and diagnostic procedures involving the eye. Such knowledge of orbital and ocular anatomy is essential to allow recognition of normal,normal variations, or an abnormality of the equine eye and orbit.
Neonates can have a variety of gastrointestinal disorders, primary and secondary in nature. Important primary disorders include con-genital abnormalities and meconium retention. One of the most important secondary lesions is generalized ileus. Gastric ulceration can occur as a primary or secondary event. This article addresses the pathophysiology, diagnosis, and treatment of gastrointestinal problems commonly observed in neonatal foals.
Abdominal surgery in foals under 30 days old has become more common with improved neonatal care. Early recognition of a foal at risk and better nursing care have increased the survival rates of foals that require neonatal care. The success of improved neonatal care also has increased the need for accurate diagnosis and treatment of gastrointestinal, umbilical, and bladder disorders in these foals. This chapter focuses on the early and accurate diagnosis of specific disorders that require abdominal exploratory surgery and the specific treatment considerations and prognosis for these disorders.
Strangles is a serious disease in horses caused by Streptococcus equi subspecies equi. In this study, genes encoding putative extracellular proteins in this subspecies have been identified using signal sequence phage display. Among these, one showed similarities to the SclB protein, a member of the collagen-like proteins of Streptococcus pyogenes. The novel gene denoted sclC encodes a protein, SclC, of 302 amino acids, containing typical features found in cell wall-anchored proteins in Gram-positive bacteria. Based on similarities to the S. pyogenes collagen-like proteins the mature SclC protein can be divided into various domains: an N-terminal non-repetitive region (A), a highly repetitive collagen-like region (CL), and a C-terminal proline-rich wall-associated region (W). Using PCR, the sclC gene was detected in all studied strains of S. equi subsp. equi and S. equi subsp. zooepidemicus. Further, antibodies against recombinant SclC were detected in a collection of sera from horses with no history of strangles as well as horses previously infected with S. equi subsp. equi. Interestingly, the sera from convalescence horses were found to have significantly increased antibody titers against the SclC protein indicating that this protein is expressed during infection of S. equi subsp. equi.
To determine whether the virus responsible for human molluscum contagiosum (MCV) is the causal agent of a similar disease in horses, in situ hybridisations using cloned fragments of human MCV DNA labelled with digoxigenin were carried out on formalin-fixed biopsy sections of lesions from two horses with molluscum contagiosum-like skin lesions. In both instances there was evidence of specific hybridisation of the labelled probe to target DNA in the sections under high stringency conditions, identified by the development of a deep blue-purple stain in the cytoplasm of cells in the stratum spinosum and stratum granulosum of the lesions and the absence of non-specific hybridisation in adjacent non-lesional areas of the epidermis. These results indicate that on the basis of very close homology of their viral DNA sequences, the causative virus of equine molluscum contagiosum is either identical with, or very closely related to, its human equivalent.
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