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Chlamydia
(klә-mid´e-ә)
a widespread genus of gram-negative, nonmotile bacteria. They are obligate intracellular parasites, totally dependent on the
host cell for energy in the form of adenosine triphosphate, which they cannot synthesize. The genus has two species, Chlamydia tracho´matis and Chlamydia psit´taci. Chlamydia trachomatis is the primary cause of human chlamydiosis and can also cause trachoma, inclusion conjunctivitis, and other conditions. Chlamydia psittaci causes psittacosis.

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