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Biofilm bacteria are hyperadhesive but less invasive. Percentage of TIGR4 cells from the total inoculum that attached and invaded Detroit-562 pharyngeal epithelial cells. The ratio of invasive pneumococci to those that are attached is also shown. Experiments were performed in triplicate. Statistical analysis was performed using a two-tailed Student t test. Asterisks denote a significant difference (P < 0.05).
