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Endemic and emerging chlamydial infections of animals and their zoonotic implications.

The Chlamydiae are a diverse group of obligate intracellular Gram-negative bacteria that are known to infect a wide variety of host species and are responsible for a wide range of diseases in animals and man. Many of these organisms have been extensively characterized and their zoonotic implications recognized. Studies of human disease first provided evidence for the disease-causing potential of Chlamydia-related bacteria; however, there is now increasing evidence that a number of these organisms may also be the causative agents for a number of pathogenic conditions of livestock that had previously remained undiagnosed. The aim of this review is to draw together the evidence for the role of the newly emerging chlamydial infections in livestock disease, the current understanding of their roles in human disease and highlight the potential for zoonotic transmission.