DONCASTER AND BASSETLAW HOSPITALS / SCIENCE PHOTO LIBRARY DONCASTER AND BASSETLAW HOSPITALS / SCIENCE PHOTO LIBRARY
Hand of a technician holds a petri dish containing agar on which red colonies of Escherichia coli (E.coli) bacteria and blue colonies of Enterococcus bacteria are being cultured in a laboratory. Both bacteria inhabit the human intestine and can cause disease.
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