Shigella flexneri. Coloured transmission electron micrograph (TEM) of a Shigella flexneri bacterium undergoing cell division. S. flexneri is the commonest cause of bacillary dysentery (shigell- osis) in developing countries. S. flexneri is a gram-negative,non-motile,bacilli (rod- shaped) bacterium. It destructively invades the intestinal mucosa,especially in young child- ren. Transmission is by oral ingestion of the faeces of a sufferer,either through contamination of the hands or,less commonly,in food and water. As few as 200 bacilli can cause disease,characterised by diarrhoea and abdominal pain. Magnification: x30,000 at 6x4.5cm size | |
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