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Biomedical subjects

D E Jasper

Publications and source records attributed to D E Jasper.

At least 37 records · Page 2Linked to original sources
PubMed1984

Acridine orange staining for diagnosis of Mycoplasma bovis infection in cow milk.

Mycoplasma organisms were readily recognized in samples of milk or udder secretions from cows with clinical Mycoplasma bovis mastitis when these samples were stained with 0.01% acridine orange at pH 3.0. Samples could be stored at -4 degrees C for several days or subjected to repeated freezing and thawing without loss of staining or fluorescence properties. Use of this procedure in diagnostic laboratories on suspect samples from cows with clinical mastitis could hasten inauguration of control measures against this highly contagious disease by several days; however, definitive diagnosis still requires standard culture methods.

Acridine Orange↗
PubMed1983

Characterization of antigens from mycoplasmas of animal origin.

Alcholeplasma laidlawii, Mycoplasma gallisepticum, M mycoides subsp mycoides, M agalactiae, M bovirhinis, mycoplasmal strain ST-6, and culture medium were compared with M bovis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, enzyme-linked immunosorbent assay (ELISA), and gel electrophoresis-derived ELISA. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated there were areas of homology and areas of heterology among the species tested. Sera from rabbits hyperimmunized with the mycoplasma organisms and noninoculated culture medium demonstrated ELISA reactivity with M bovis antigens immobilized on polystyrene. Absorption of the serum from a rabbit hyperimmunized with M bovis reduced 65.9% of its reactivity with culture medium, 29.7% to 32.7% of its reactivity with the heterologous species, and 21.1% of its reactivity with the homologous species. Gel electrophoresis-derived ELISA performed on immobilized M bovis antigens separated by molecular weight, using sera from rabbits hyperimmunized with the mycoplasmal species under study and noninoculated culture medium revealed antigenic components which are shared among species or with the culture medium and several components which may be unique to M bovis.

Animals↗
PubMed1983

Prevalence of mycoplasmas and immune responses to Mycoplasma bovis in feedlot calves.

Microbiological cultural, cytologic, and immunologic observations were made on 30 calves. The eyes, nares, and bronchioalveolar region were subjected to microbiological cultural examination for mycoplasmas. Four of the examinations of 30 eyes, 15 of those of 30 nasal tissues, and 25 of those of the 30 bronchioalveolar regions from the 30 calves were positive for mycoplasmas. Mycoplasma bovis and M bovirhinis were the most prevalent species. Cytologic examinations of peripheral blood and bronchioalveolar washes did not show pathologic changes. Results of indirect hemagglutination, enzyme-linked immunosorbent assay, lymphocyte-stimulation tests on peripheral blood cells, and skin testing demonstrated only a low prevalence of immune recognition of M bovis. Infection and immune response were studied in 3 calves for 10 weeks before, and for 4 weeks after, intratracheal administration of live M bovis.

Animals↗
PubMed1982

Gel electrophoresis-derived enzyme-linked immunosorbent assay of serum from cows resistant to and cows susceptible to challenge exposure with Mycoplasma bovis.

The gel electrophoresis-derived enzyme-linked immunosorbent assay (GED-ELISA) technique combines the high resolving power of sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to separate complex molecules by their molecular weights, with the high sensitivity of the ELISA to detect specific antibody, Sera from 4 cows that demonstrated resistance to challenge exposure and 4 cows that were susceptible to challenge exposure with live virulent Mycoplasma bovis strain 201 were subjected to GED-ELISA to determine reactivity with M bovis antigenic components separated by SDS-PAGE. The GED-ELISA mean reactivity of sera from the 2 groups did not differ significantly (P = 0.17) when subjected to analysis of variance. Sera from both groups recognized distinct fractions of M bovis.

Animals↗
PubMed1981

Detection of Mycoplasma bovis specific IgG in bovine serum by enzyme-linked immunosorbent assay.

The enzyme-linked immunosorbent assay (ELISA) was optimized for detection of Mycoplasma bovis-specific IgG in bovine serum. The test is rapid, reproducible, convenient, and sensitive. With this assay, the serum from naturally infected and immunized calves demonstrated the presence of antibodies early in infection and rapid increase in titers during the infection. Cross-reactivity of bovine serum with mycoplasma antigens of bovine, caprine, avian, and environmental sources was tested with this assay system. Cross-reaction was measurable in all instances, with the strongest reaction measured between M bovis and M agalactiae.

Animals↗
PubMed1980

Bovine mycoplasmal mastitis from intramammary inoculations of small numbers of Mycoplasma bovis: local and systemic antibody response.

Typical mycoplasma mastitis spread to all four quarters in each of four cows after each cow was inoculated in one quarter with 70 colony-forming units of Mycoplasma bovis. Up to 50 days after inoculation, immunoglobulin (Ig) M was the predominant Ig responsible for serum indirect hemagglutination titers. After 57 days, IgG was predominant. Milk whey indirect hemagglutination titers did not distinguish between quarters resolving the infection and those that did not. Milk whey IgG and IgA concentrations increased in quarters that resolved the infection and in quarters that did not. In the initially inoculated quarters, total daily production of IgG was greater in the quarter resolving the infection than in the three quarters not resolving the infection. Total IgA production was also higher at and after the peak of infection in the quarter resolving the infection than in the quarters that did not.

Animals↗
PubMed1979

Prevalence of mycoplasmal bovine mastitis in California.

Seven species of mycoplasma plus one or more unknown species were found to cause bovine mastitis in California. Both the frequency of cases and number of species of mycoplasma in samples received at the laboratory have increased from 1976 to 1978. By survey, nearly 4% of samples of bulk tank milk from dairy farms were found to contain mycoplasma of potential pathogenic significance. Acholeplasma laidlawii was frequently isolated from samples both from cows and from farm bulk tanks during wet, rainy weather in the spring of 1978, apparently as contaminants only. The prevalence of positive bulk tank milk samples in an area appeared to parallel the prevalence of clinical mycoplasmal mastitis problem herds.

Animals↗
PubMed1978

Mycoplasma alkalescens-induced arthritis in dairy calves.

Mycoplasma alkalescens was isolated from 6 of 7 synovial fluid samples taken by arthrocentesis from 3-week- to 4-month-old Holstein-Friesian calves with severe arthritis (tibiotarsal or carpal joints). Approximately 30 of 215 calves in the herd were affected. In one 6-week-old calf, M alkalescens was isolated from the liver, right tibiotarsal joint, right and left popliteal lymph nodes, and an exposed umbilical artery. Intraarticular inoculations of broth cultures of M alkalescens initially induced a febrile response and then severe fibrinopurulent arthritis. Intravenous inoculation of M alkalescens induced only a febrile response. The natural disease may have been a complication of umbilical exposure to M alkalescens, causing omphaloarteritis and subsequent arthritis. Before and during the arthritis problem, the umbilicus of newborn calves was dipped in an organic iodine product with 10% glycerin, marketed as a postmilking teat dip. After the cause of the arthritis was determined, the umbilicus of each newborn calf was treated with 7% tincture of iodine and no new cases of arthritis occurred.

Animals↗
PubMed1978

Distribution of enterobacteriaceae in recycled manure bedding on California dairies.

The distribution of coliform organisms on three California dairies which use a system of automatic flushing of alley ways and composted, recycled manure solids as free stall bedding for utilization of waste was studied. There was a wide distribution of Escherichia coli, Klebsiella, and Enterobacter and to less extent Citrobacter organisms. Klebsiella were not commonly in bovine feces. Composting manure solids effectively reduced coliform counts to few or to zero. However, if given proper conditions of moisture and temperature, coliforms could multiply to large numbers again in composted solids whether from survivors or from external contamination. Dried composted manure was satisfactory material for bedding of free stalls provided it was dried properly before application.

Animal Feed↗
PubMed1977

Mycoplasma and mycoplasma mastitis.

Mastitis due to mycoplasma has been reported sporadically from several countries in Europe, Australia, Israel, New Zealand, and many states in the United States. Most reported occurrences are due to Mycoplasma bovis, but 5 other mycoplasmas are reported to cause mastitis. A total of 5 species of mycoplasma have been isolated from cows with mastitis in California. Therapy trials with M bovis infections have not been encouraging. Recovery is slow, and shedding of mycoplasma into milk of apparently recovered cows for an indefinite period is common.

Animals↗