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May 19, 1956


JAMA. 1956;161(3):270. doi:10.1001/jama.1956.02970030088027

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To the Editor:—  In The Journal, Feb. 18, 1956, page 544, my co-workers and I, of the Research Unit for Genito-Urinary Tuberculosis, presented some recent work in an article entitled "Treatment of Renal Tuberculosis with Triple-Drug Therapy." In this article we commented on the difficulty in sterilizing cystoscopes that had been contaminated with Mycobacterium tuberculosis. We stated that these were best sterilized with 10% formaldehyde solution (Formalin) and further that the Lehn & Fink Products Corporation instrument germicide was also effective in sterilizing these instruments within a period of one hour. Since publication of that article, however, there have been a few instances where one hour of immersion in the Lehn & Fink Products Corporation instrument germicide was not entirely effective in eradicating all of the Myco. tuberculosis organisms on some of our cystoscopes. As a consequence, we feel forced to retract our statement that immersion for one hour in

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