A taxonomic study of Mycobacterium intracellulare isolated from swine

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  • TSUKAMURA Michio
    The National Sanatorium, Chubu Chest Hospital National Institute of Animal Health
  • NEMOTO Hisashi
    The National Sanatorium, Chubu Chest Hospital National Institute of Animal Health

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タイトル別名
  • A Taxonomic Study of <i>Mycobacterium intracellulare</i> Isolated from Swine

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説明

Twenty-five strains of mycobacteria, every strain taken from a different animal, were isolated from tuberculosis-like lesions of the submandibular lymph node or the mesenteric lymph node of swine. Fifteen strains were identified as Mycobacterium intracellulare, four strains as Mycobacterium scrofulaceum, three strains as Mycobacterium fortuitum, one as Mycobacterium tuberculosis, one as a chromogenic M. intracellulare, and one as an unidentified Group IV. Two strains (T-128 and T-167) were initially identified as M. intracellulare, as these were slow-growing nonphotochromogens, did not reduce nitrate, two week-arylsulfatase-positive, did not hydrolyze Tween 80, and ethambutol-resistant. They, however, showed urease, nicotinamidase and pyrazinamidase activities and differed from other M. intracellulare strains in several other characteristics. Majority of the porcine isolates of M. intracellulare were serotypes "Davis" and "IV." On the other hand, majority of the M. intracellulare strains isolated from patients in this country were serotypes "Arnold" and "Yandle." Findings suggest that swine infected with M. intracellulare probably are not the main source of M. intracellulare strains that infect humans. Characteristics of a rapid-growing mycobacterial strain, which was pathogenic for swine, were described. This organism was differentiated from known pathogens of rapid-growing mycobacteria, M. fortuitum and Mycobacterium chelonei.

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