Clostridium difficile bacteria. Coloured scanning electron micrograph (SEM) of a dividing C. difficile bacterium and one of its microscopic spores (upper right). These rod-shaped bacteria cause pseudomembranous colitis, one of the most common hospital-acquired infections, and antibiotic-associated diarrhoea. Infection can be fatal. Treatment is with antibiotic drugs, although this bacterium has become increasingly resistant to the use of antibiotics. Magnification: x53,000 when printed at 10 centimetres wide.
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