Experimental Infection of the Chimpanzee Urethra and Pharynx with Chlamydia trachomatis

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Abstract
An isolate of Chlamydia trachomatis obtained from a man with nongonococcal urethritis was used to produce experimental urethral and pharyngeal infections in chimpanzees. After urethral inoculation of 8 X 10(1) inclusion-forming units (IFU), infections were established in three of three animals; urethral discharges developed in two. The infections persisted for five to nine weeks. Larger inocular (7 X 10(2) and 1 X 10(5) IFU) produced pharyngeal infections in two animals. The third animal's pharynx was not infected by 1 X 10(5) IFU. Chlamydial complement-fixing antibodies increased significantly in sera of two of three animals. This study provides an animal model for study of mucosal infection by C. trachomatis. The relative resistance of the chimpanzee pharynx to infection parallels clinical observations in man.

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