The first, CHLAMYDIA TRACHOMATIS, has a number of strains. In men, it is a major cause of nongonococcal urethritis, which may cause a discharge from the penis. In women, the infection is usually symptomless, but it can lead to salpingitis. A baby born to a woman with chlamydial infection may acquire an acute eye condition called neonatal ophthalmia. In parts of Africa and Asia, certain strains of CHLAMYDIA TRACHOMATIS cause trachoma, a serious eye disease.
A second species of chlamydiae, CHLAMYDIA PSITTACI, mainly affects birds but can occasionally spread to people who have contact with pigeons, parrots, parakeets, or poultry, causing a type of pneumonia called psittacosis.
Treatment for chlamydial infections is with antibiotic drugs.