DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Clostridium difficile bacteria, coloured scanning electron micrograph (SEM). 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: x1500 when printed at 10 centimetres high.
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