The Classification of Acid-Fast Bacteria. II.

نویسندگان

R E Gordon

W A Hagan

چکیده

In a previously reported attempt (Gordon, 1937) to find standards for the classification of the rapidly-growing, non-pathogenic mycobacteria, we presented the results of a cultural study of a collection of 252 strains from soil, plants, human and animal tissues and secretions. Eighty per cent of the strains were readily separated into three groups of closely-related cultures. The remaining 20 per cent of the strains, which differed from the above and in most cases from each other, were arbitrarily distributed among the three major groups as sub-groups. Since 84 per cent of the cultures of the collection had been isolated from soil by means of S6hngen's technique, there arose the question of whether cultures from sources other than soil would fall into the same groups and whether the standards previously set would be adequate. It seemed possible that some of the unrelated, single strains of our soil collection might be represented in large numbers in an assemblage of cultures from other sources and isolated by other methods. Seventy-nine additional strains of saprophytic acid-fast bacteria have been studied by the same methods described in our previous report. The numbers and sources of the cultures are recorded in table 1. The fish strains were isolated on glycerinated egg medium; the soil and water cultures were obtained by S6hngen's technique (1913).

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