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Chlamydial vaccine development.

Chlamydial organisms cause a wide spectrum of diseases in humans, other mammals and birds and have an enormous economic impact on both human and animal health and on agricultural industries worldwide. The two principal pathogens of humans are Chlamydia trachomatis and Chlamydophila pneumoniae (Schachter, 1988; Saikku, 1998).Chlamydia trachomatis is a cause of chronic conjunctivitis and is also the most common cause of sexually transmitted disease in humans. Infections can go unnoticed and, if left untreated, can ultimately result in scarring and fibrosis of ocular and genital tissues, resulting in trachoma (the leading cause of preventable blindness worldwide) and pelvic inflammatory disease, which can lead to infertility, ectopic pregnancy and chronic pelvic pain. Chlamydophila pneumoniae causes acute respiratory disease and is responsible for 5–10% of the cases of community-acquired pneumonia, bronchitis and sinusitis. The organism has also been associated with chronic obstructive pulmonary disease, asthma, reactive airway disease, Reiter’s syndrome, sarcoidosis and atherosclerosis.