Whooping cough bacteria. Coloured scanning electron micrograph of a section of human tracheal epithelium showing the rod-shaped bacteria Bordetella pertussis (green), lodged at the base & between the cilia at centre. B. pertussis is the agent of whooping cough, a respiratory tract infection characterised by fits of coughing that end in inspiratory whoops. The bacteria cause a dramatic loss of cilia, or fine hairs that protect the respiratory tract from dust and particles. The micrograph shows a region of epithelium in the foreground where the cilia have been flattened by the bacteria. Magnification: x6100 at 6x7cm size.
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