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Average surface area contamination after five patient encountersa
| Very large | Large | Medium | Small | |
|---|---|---|---|---|
| Paper bag | 13 cm2 | 10.8 cm2 | 23.3 cm2 | 19.5 cm2 |
| Tabletop | 6.7 cm2 | 7.8 cm2 | 16.9 cm2 | 15.8 cm2 |
| Hook | 14.4 cm2 | 10.8 cm2 | 20 cm2 | 8 cm2 |
Contamination area: small <1 cm2; medium ≥1–<2.5 cm2; large ≥2.5–5 cm2; very large ≥5 cm2.
