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Gonorrhoea bacteria. Coloured scanning electron micrograph (SEM) of gonorrhoea bacteria (Neisseria gonorrhoeae, round) on a human epithelial cell. Gonorrhoea is a venereal (sexually-transmitted) disease. Infection is of the urethra, causing a discharge of yellow fluid. It readily spreads to surrounding tissues. If it spreads further to the blood or brain, it may be fatal. Treatment is with antibiotic drugs.
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