The Persistence of Avian Tubercle Bacilli in Soil and in Association with Soil Microörganisms

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Abstract
Avian bacilli were inoculated into sterile soil in pure culture, in association with a no. of pure cultures of, and in association with various mixtures of, soil microorganisms. The pathogen was also inoculated into toluol-sterilized and into unsterilized soil. Persistence of the tubercle bacillus was studied by a specially devised plate-count procedure; it multiplied in sterile soil and when associated with some bacteria. Under the conditions of the same exp., a fungus checked its development, especially in manured soil. In general, bacteria, fungi and actinomycetes did not markedly depress the no. of tubercle bacilli in soil; they survived in toluol-sterilized soil under a variety of conditions. Recovery was successful after 3 mos. Slow destruction occurred in soil which had not been sterilized. Plate-count nos. were reduced to about 1/6 of the original counts in 1 mo.; if the same death rate continued, the organisms would survive for many mos.

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