Corynebacterium Equi (Magnusson, 1923) in the Submaxillary Lymph Nodes of Swine

The incidence of C. equi in tuberculous and nontuberculous swine is essentially the same. The identification of C. equi cannot be definitely established by microscopic examination and appearance of the colony. The acidfast character of the micro-organism is doubtful and appears to be an undependable...

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Bibliographic Details
Published in:The Journal of infectious diseases 1940-11, Vol.67 (3), p.243-251
Main Authors: Karlson, Alfred G., Moses, Harold E., Feldman, William H.
Format: Article
Language:English
Subjects:
Antigens
Bacteria
Bacteriology
Chemical suspensions
Emulsions
Lesions
Lymph nodes
Rhodococcus equi
Sodium
Swine
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Summary:The incidence of C. equi in tuberculous and nontuberculous swine is essentially the same. The identification of C. equi cannot be definitely established by microscopic examination and appearance of the colony. The acidfast character of the micro-organism is doubtful and appears to be an undependable criterion for purposes of identification. Agglutination reactions cannot be used to identify C. equi because the reactions are type-specific and not speciesspecific. Methods of identifying C. equi should include a study of reactions on differential mediums and also complement fixation tests, using antigens that have been extracted with acid to remove type-specific fractions. The resistance of C. equi to oxalic acid and sodium hydroxide is unusual for a nonsporulating and nonacidfast micro-organism. Two strains of C. equi were apparently nonpathogenic for young swine on a single exposure when administered by mixing large quantities of young cultures with the feed.
ISSN:0022-1899
1537-6613
DOI:10.1093/infdis/67.3.243