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  • Title: Protein A in Staphylococcus intermedius isolates from dogs and cats.
    Author: Cox HU, Schmeer N, Newman SS.
    Journal: Am J Vet Res; 1986 Sep; 47(9):1881-4. PubMed ID: 3767095.
    Abstract:
    The presence and quantity of extracellular and cell-bound protein A of Staphylococcus intermedius isolates from dogs and cats were determined, using an enzyme-linked immunoglobulin-binding assay. Horseradish peroxidase-conjugated rabbit anti-bovine immunoglobulin G purified by affinity chromatography was reacted with whole cell and supernatant fractions of S intermedius (n = 139), a protein A-producing strain of S aureus, and a protein A-deficient strain of S epidermidis. Extracellular protein A was found in 118 (84.9%) of 139 isolates of S intermedius. Most (69/118; 58.5%) of these isolates produced greater than 0.2 micrograms of extracellular protein A/ml. Cell-bound protein A was found in 6 (4.3%) of 139 isolates. Only 1 of these isolates contained cell-bound protein A exclusively. The other 5 isolates produced significantly greater amounts of extracellular protein A than cell-bound protein A. Additionally, greater than 96% of extracellular protein A could be removed from supernatants by adsorption with agarose gel containing immunoglobulin G.
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