Inclusion conjunctivitis is a milder form that occurs in both children and adults. This form generally heals without scarring or blindness. In 1997, approximately 320,000 cases were reported to the Centers for Disease Control. Chlamydia induce interferon and are sensitive to it. During infection, antibodies are synthesized but recovery is not generally protective.
Trachoma is prevalent in Africa and Asia, generally in hot and dry areas.
The organisms are very persistent. Their habitat is similar to that of Neisseria and Haemophilus . Infection can occur via swimming in unchlorinated pools, sharing towels or by passage through the birth canal. Diagnosis of trachoma is usually good. Likewise, the genital vesicles associated with LGV are characteristic.