Trachoma is the world’s leading infectious cause of blindness. This disease causes chronic keratoconjunctivitis resulting from the obligate intracellular bacterium Chlamydia trachomatis.
C trachomatis can be spread by either direct contact with an infected person's eyes or nose or indirect contacts, such as via contact with clothing or flies that have come into contact with an infected person's eyes or nose. Poor sanitation, crowded living conditions, and insufficient clean water and toilets can also increase the spread of trachoma