Volume 10, Number 2—February 2004
THEME ISSUE
2004 SARS Edition
Infection Control
Surgical Helmets and SARS Infection
James L. Derrick*
and Charles D. Gomersall*
and Charles D. Gomersall*
Table
Ratio of ambient-to-device concentrations of 0.02- to 1-μm–diameter particles (median [range])a
| Exercise | Stryker T4 | Stackhouse FreedomAire | 3M 8233 N100 mask with surgical mask and face shield |
|---|---|---|---|
| Normal breathing | 4.5 (4–5) | 3 (2–4) | 32,550 (1,420–60,900) |
| Deep breathing | 4.5 (4–5) | 3 (2–3) | 21,550 (4,150–99,300) |
| Head side to side | 4 (4–5) | 3 (2–3) | 15,675 (681–138,000) |
| Head up and down | 4 (3–5) | 3 (2–3) | 19,300 (380–138,000) |
| Talking | 4 (3–5) | 3 (2–3) | 1,550 (394–18,200) |
| Bending over | 3.5 (3–4) | 2 (2–3) | 7,695 (1,620–31,000) |
| Normal breathing | 4 (3–5) | 2.5 (2–3) | 22,100 (4,670–163,000) |
| Fit factor | 3.8 (3.7–4.8) | 2.5 (2.0–3.1) | 6,392 (962–50,519) |
aRatios for Stryker T4 and Stackhouse FreedomAire were significantly lower in all tests compared to the combination of N100 mask, surgical mask, and face shield (p <0.004.)
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