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Shigella bacteria. Scanning electron micrograph (SEM) of Shigella sp. Bacteria (red) on the surface of a cell. Shigella sp. are Gram-negative rod-shaped bacteria (bacilli) and are the causative agent of human shigellosis. They infect the large intestine and cause dysentery, which can vary in severity from a mild attack of diarrhoea to an acute infection.
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