Neisseria gonorrhoea. Illustration based on a Transmission Electron Micrograph (TEM) of N. gonorrhoea, the bacteria that cause the sexually transmitted disease gonorrhoea. These bacteria are classed as gram-negative. Their rounded cells (cocci) are usually found stuck together in pairs. The hair-like protein filaments on the cell surface (called pili) help the bacteria bind to cells in the human body during an infection. Gonorrhea, or "the clap", causes pain on urination and a discharge of pus from the vagina or penis. Sometimes there are no symptoms; in other cases complications develop, potentially leading to sterility. Magnification unknown.
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