Chlamydia trachomatis bacteria, coloured transmission electron micrograph (TEM). These spherical bacteria (dark red) 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: x23000 when printed 10 centimetres wide.
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