Occurrence and Characterization of »Avium‐Like« Mycobacteria Isolated from Animals in Sweden

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Abstract
Cultures (431) of avium-like mycobacteria (ALM) were isolated from wild and domestic animals during 1974-76 at the National Veterinary Institute, Stockholm. Of these, 50 isolates from pigs were studied by growth-chromogenicity, pathogenicity and biochemical tests. TLC was performed and, on some isolates, serotyping. All 50 isolates belonged to Runyon''s group III and were pathogenic for chickens; none split oleic acid from Tween 80; 47 gave tellurite reduction within 3 days; 1 was arylsulfatase-positive after 3 days and a further 4 after 14 days. The biological and biochemical tests permit assignation of the 50 isolates to the Mycobacterium avium-M. intracellulare complex. The lipid patterns of the isolates examined were analyzed by TLC; 35 isolates showed a lipid pattern similar to that of A 2 of the fowl reference strain; 3 belonged to lipid type A 1 and 4 to A 3. Eight could not be typed. Of 22 isolates, 14 were assigned to M. avium serotypes.