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Gonorrhoea bacteria. Coloured scanning electron micrograph (SEM) of a Neisseria gonorrhoeae bacteria (yellow) infecting a human epithelial cell (brown). This Gram-negative bacteria causes the sexually transmitted infection gonorrhoea. Symptoms include a vaginal or urethral discharge and a burning sensation on urination. However, the majority of infected women develop no symptoms. Treatment is with antibiotics.
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