The isolation profiles of environmental mycobacteria present in soil, water, and dust samples, and sputum samples of persons with symptoms of chest infection in the South Indian Mycobacterium bovis BCG (bacillus Calmette-Guérin) trial area were compared. Isolates belonging to the Mycobacterium avium-intracellulare-scrofulaceum complex were predominant in water, dust, and sputum samples and Mycobacterium fortuitum-complex organisms were predominant in soil samples irrespective of the season of the year.
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Kamala et al. (1994) studied this question.
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