FIG 7 .

M. catarrhalis UspA2- and UspA2H-dependent adhesion to collagens in human lung fibroblasts and trachea. (A) Lung fibroblasts targeted by M. catarrhalis WT and UspA2 and UspA2H mutants were analyzed by SEM. Bacteria are visualized in green pseudocolor. (B) Adherence of M. catarrhalis strains per mm² of fibroblasts. (C) M. catarrhalis WT and UspA2 and UspA2H mutants adhere to human tracheal tissues. (D) Adherence of M. catarrhalis strains per mm² of trachea. Error bars indicate standard deviations. Statistical analyses were performed using Student’s t test. ***, P ≤ 0.001.