Justin Dellinger

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The phenotype of bovine milk lymphocytes was investigated and compared to peripheral blood lymphocytes using monoclonal antibodies specific for bovine leukocyte differentiation antigens and flow cytometry. T lymphocytes traffic selectively into bovine milk while B lymphocytes represent a minor population in milk by comparison to peripheral blood. The vast(More)
This study investigated the effect of naturally acquired bacterial infection of the bovine mammary gland on subpopulations of T lymphocytes and cytokine expression in milk. Twenty-nine lactating cows with mastitis were compared to 12 normal animals. CD4+ lymphocytes represented a significantly greater percentage of the milk-derived lymphocytes in infected(More)
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(More)
Milk from 172 commercial cows with mild to moderate clinical mastitis was tested with five antibiotic residue detection assay systems. One hundred cows were treated with one of two intramammary beta-lactam antibiotics, and the remaining 72 cows were treated with intramuscular oxytocin. Milk samples were collected pretreatment, twice after therapy, and again(More)
A 20% fenthion (0,0-dimethyl-0-(3-methyl-4-(methylthio)-phenyl) phosphorothionate) formulation was applied topically to dogs at 8 mg/kg, 2 treatments at 14-day intervals, and 33 mg/kg, 4 treatments at 7-day intervals. Control dogs received 4 treatments at 7-day intervals of the proprietary vehicle. Following the last dose, the dogs were observed for a(More)
Seven teat dip and sanitizer products were tested in vitro and in vivo for mycoplasmacidal activity against Mycoplasma agalactiae subsp. bovis (M. bovimastitidis). Most, but not all products tested appeared to kill the mycoplasma at satisfactory dilutions. These mycoplasma survived longer on teat skin during humid, rainy weather than during warm, dry(More)
A procedure isolating immunoglobulins specific for common gram-negative bacterial core antigens is described. A polyclonal reagent was purified by ammonium sulfate precipitation, dialysis, and column affinity chromatography. The initial vaccinal antigen was an Ra mutant Escherichia coli O111:B4 (strain J5). The capture antigen was lipopolysaccharide derived(More)
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(More)
Antimicrobial drug residue testing was performed on milk samples obtained from 8 cows with experimental endotoxin-induced mastitis, using 4 commercially available assay kits. Although none of the cows in the study received antimicrobials, only 1 of the 4 assay procedures, assay C, had consistently negative results (specificity = 1.00). The proportion of(More)