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. 2018 Apr 9;8:5681. doi: 10.1038/s41598-018-23830-4

Figure 5.

Figure 5

B. pseudohinzii (strain 3227) attaches to cilia and damages the epithelium in an in vitro-infection model. Tracheal explants were cultured for 24 h, with following addition of bacteria for 4 h or 24 h, and analysed by scanning electron microscopy. (a,d) Upon cultivation for 24 + 4 h without adding of bacteria, cilia are regularly orientated and no bacteria are visible. (b,e) The trachea was cultivation for 4 h in 1 ml medium with 0.4 × 104 CFU B. pseudohinzii. A single bacterium is seen attached to cilia (arrow). (c,f) Cultivation for 4 h with a higher dose of B. pseudohinzii (2.3 × 108 CFU). No obvious alterations of cilia or ciliated cells can be observed. Bacterial chains are attached to cilia (arrows). (g,j) Cultivation for 48 h without adding of bacteria. Ciliated cells are intact and cilia show no signs of damage. (h,k) Cultivation for 24 h with 0.4 × 104 CFU B. pseudohinzii. (i,l) Cultivation for 24 h with a higher dose of B. pseudohinzii (2.3 × 108 CFU). Increased numbers of bacteria are attached to cilia (arrows), cilia look flattened. Single ciliated cells are massively damaged (dotted arrow).