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Lymphogranuloma venereum, also known in french as Nicolas-Favre disease, is a sexually transmitted infection (STI). The pathogen or bacteria responsible for this infection is chlamydia trachomatis. There are different types of chlamydia trachomatis, with the majority of them only capable of inducing a superficial infection of the skin. The more virulent types L1-L3 can provoke a generalized infection and associated genital ulcerations.