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Fig. 2 | Critical Care

Fig. 2

From: Biofilm formation on three different endotracheal tubes: a prospective clinical trial

Fig. 2

Scanning electron microscopy of biofilm formation on the surface of endotracheal tubes. a Typical low-grade (score < 4) biofilm formation. b Typical high-grade (score ≥ 7) biofilm formation (low magnification). c Colonies of microorganisms embedded in biofilm matrix (high magnification). d Scrape marks on the surface of an endotracheal tube probably caused by use of a suction catheter

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