Abstract
Mycobacteria other than tubercle bacilli were isolated from urine specimens of 42 patients. No genitourinary tract lesions which could be attributed to these organisms were found. In only two of these patients was it plausible that mycobacterial infections were present. Neither patient had demonstrable renal lesions, however, whereas both had disease elsewhere (one, the pleura; the other, the lungs and pericardium). As many saprophytic mycobacteria are common in the environment, laboratory contamination by these organisms must be guarded against.

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