FIG. 2.

SEM of submerged primary airway epithelial cell culture that had been infected for 4 h with NTHI 2019. (A) An example of the distribution of binding of NTHI to the surfaces of cells within the population. Bacteria are bound to a limited repertoire of cells in the population. The scale bar in panel A represents 20 μm. (B) A higher-magnification view of a region on the same sample. The sharp demarcation in NTHI 2019 binding to the surface of one cell with minimal binding of bacteria to an adjacent cell can be seen. This was a typical observation. The scale bar in panel B represents 10 μm.