A colour-enhanced scanning electron micrograph image showing a cluster of Clostridium difficile on a surface. Clostridium difficile is a species of Gram-positive bacteria that causes severe diarrhea and other intestinal disease when competing bacteria in the gut flora have been wiped out by antibiotics.
B0006630 2007 Collection: Medical Photographic Library Copyrighted work available under Creative Commons by-nc-nd 2.0 UK: England & Wales, see http://creativecommons.org/licenses/by-nc-nd/2.0/uk/