Abstract
A photochromogen,M. kansasii, produces cleared areas when plated on heavier inoculations of human, H37Rv, strain. No phage could be demonstrated. From an area spread with H37Rv and theM. kansasii was isolated a chromogenic rough type colony the organism of which produced lesions in guinea pigs. It is suggested that a cross or recombination may have occurred to produce this variant type.
A phage (LEO) isolated from a sarcoid lesion produced three plaque types on H37Rv. One of these, a very turbid plaque type, was isolated in series through fourteen transfers. The three plaque types were produced throughout this series. Phage from the last isolation was plated on ATCC 607, on which only one plaque type was produced. After eight transfers in series on ATCC 607 the phage was plated on H37Rv. On H37Rv it produced the three types of plaques similar to the original. It is suggested that a possible defective prophage may be present in H37Rv that is combining with or influencing the LEO phage thus producing the variant types.
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A part of the material reported in this paper has been published in: Amer. Rev. resp. Dis.98, 41 (1968).
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Redmond, W.B. Mycobacterial variations as influenced by phage and other genomic factors. Pneumologie 142, 191–197 (1970). https://doi.org/10.1007/BF02095215
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DOI: https://doi.org/10.1007/BF02095215