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Gonorrhoea bacteria. Coloured scanning electron micrograph (SEM) of Neisseria gonorrhoeae bacteria (round, yellow) on the surface of an epithelial cell (brown). Epithelial cells are the cells that make up the skin and the lining of internal body cavities and spaces. N. gonorrhoeae is a Gram-negative bacteria that causes the sexually transmitted infection gonorrhoea. Symptoms include vaginal or urethral discharge and a burning sensation on urination.
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