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Comparison of the biofilm indices of invasive and noninvasive nontypeable H. influenzae strains. Thirty-one noninvasive NTHi strains were collected from nasal cavities or sputum of children with respiratory infections (these strains were used only for biofilm assays). The boxplot shows the medians and 10th, 25th, 75th, and 90th percentiles; outliers are plotted as individual points. The biofilm index was defined using the average OD570 value.
