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Table 3 Criteria of interpretation of biofilm production

From: N-acetylcysteine inhibit biofilms produced by Pseudomonas aeruginosa

Biofilm production

average optical density (OD)

no biofilm producer

≤ ODc

weak biofilm producer

ODc < ~ ≤ 2 × ODc

moderate biofilm producer

2 × ODc < ~ ≤ 4 × ODc

strong biofilm producer

> 4 × ODc

  1. Note: optical density cut-off value (ODc) = average OD of negative control + 3 × SD of negative control.