Thomas J. Spira, MD
To the Editor: In the article by Bach and Colleagues (1) on odynophagia from aphthous ulcers of the pharynx and esophagus in the acquired immunodeficiency syndrome (AIDS), the CD4 cell counts were incorrect. For Patients 1, 2, and 3, the counts were listed as 12 X 109/L, 383 X 109/L and 97 X 109/L, respectively. These counts should no doubt be 0.012 X 109/L, 0.383 X 109/L, and 0.097 X 109/L, or 12 X 106/L, 383 X 106/L, and 97 X 106/L, respectively. Errors of this type almost inevitably arise from the conversion of these counts from cell counts per
Spira TJ. SI Units in Hematology. Ann Intern Med. ;109:996. doi: 10.7326/0003-4819-109-12-996_2
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Published: Ann Intern Med. 1988;109(12):996.
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