Chlamydia trachomatis types 1, 2 and 3 is responsible for this sexually transmitted infection. It is endemic in the tropics, with the highest incidences in Africa, India and South East Asia.
The primary lesion is a painless ulcerating papule on the genitalia and only occurs in one-quarter of the patients. A few days after this heals, regional lymphadenopathy develops. The lymph nodes are pai