From: Biofilm formation on three different endotracheal tubes: a prospective clinical trial
Biofilm coverage | Biofilm density | Biofilm thickness scale | Biofilm grade |
---|---|---|---|
Determined at 100× to 1000× mag | Determined at 10,000× to 30,000× mag | Determined at 10,000× to 50,000× mag | (coverage + density + thickness) |
0 no biofilm 1 scarce (<  10% coverage) 2 clusters (10–70% coverage) 3 confluent (>  70% coverage) | 0 no biofilm 1 low/very porous 2 intermediate 3 high/compact | 0 no biofilm 1 thin (0.1–1.0 mm) 2 medium (1.1–7 mm) 3 thick (> 7 mm) | 0 no biofilm 1–3 low grade 4–6 medium grade 7–9 high grade |