Coloured scanning electron micrograph (SEM) of Listeria monocytogenes, Gram-positive, regular, non-sporing, rod prokaryote. Zoonotic microorganism, domestic mammals, rodents and birds contaminate water, vegetables and cheese, which, if ingested by humans, can cause listeriosis, meningitis, septicaemia, encephalitis, food poisoning and risk of spontaneous abortion in pregnant women. Magnification: x3,000 when shortest axis printed at 25 millimetres.
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