Volume 12, Number 3—March 2006
Letter
Hand Sanitizer Alert
Scott A. Reynolds*
, Foster Levy†, and Elaine S. Walker*†
, Foster Levy†, and Elaine S. Walker*†
Table
CFU per plate before and after treatment with various concentrations of ethanol
| Treatment | Mean pretreatment CFU (range) | Mean posttreatment CFU (range) | No. trials | |t|* | p* | Mean change (%) |
|---|---|---|---|---|---|---|
| Tap water | 175 (117–234) | 206 (100–321) | 4 | 1.25 | 0.30 | +10 |
| 40% ethanol | 531 (132–1,413) | 621 (75–1,733) | 5 | 0.30 | 0.39 | +3 |
| 40% gel | 246 (51–602) | 232 (56–693) | 9 | 0.61 | 0.56 | +53 |
| 62% gel | 171 (33–563) | 12 (1–24) | 9 | 5.73 | <0.001 | –82 |
| 40%→62% gel | 473 (114–1,257) | 26 (10–48) | 5 | 6.21 | 0.003 | –90 |
*|t| = result of paired t test; p = probability of |t|.
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