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Abstract
Plasmid profile analysis was performed on Mycobacterium avium/M. intracellulare isolates from patients with AIDS, from children with cervical lymphadenitis, and from environmental sources. The frequency of plasmid-containing strains was found to be, respectively, 5/16 (31 %), 4/15 (27 %) and 1/15 (7 %). The data indicate that plasmids occur more frequently among clinical isolates than among environmental isolates, and support a possible pathogenic role of the plasmids.