To the Editor: The articles by Gorbach and Bartlett on anaerobic infections (N Engl J Med 290:1177–1184, 1237–1245, 1289–1294, 1974) stress the frequency of contamination of the upper respiratory tract with aerobic and especially with anaerobic bacteria. Therefore, they suggest transtracheal aspiration to obtain specimens devoid of upper-airway contamination. Transtracheal aspiration is a very useful technic. However, it is uncomfortable and occasionally associated with serious complications. Would it not be possible to produce a sterile double-lumen tube of the nasogastric type whose outer-tube tip is covered and the inner tube can be advanced? With this device the outer tube is.
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