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Chlamydia trachomatis bacteria, coloured transmission electron micrograph (TEM). These spherical bacteria (orange and green) are human parasites and live only inside host human cells and cause various types of genital, eye and lymph node infections. These infections include sexually transmitted diseases, non-specific urethritis (NSU) and lymphogranuloma venereum (enlarged lymph glands). The bacteria also cause trachoma eye disease, a leading cause of blindness. Treatment is with antibiotics. Magnification: x26000 when printed 10 centimetres wide.
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