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Ocular involvement with Chlamydia psittaci (strain M56) in rabbits inoculated intravenously
Abstract:
Fourteen albino rabbits were inoculated intravenously with 10(3.5)-10(4.0) mouse ICLD(50) of Chlamydia psittaci (strain M56) of mammalian origin. Ocular lesions accompanied the chlamydial infection in the rabbits. Bilateral anterior uveitis, a common occurrence, began on the second or third day and subsided by the tenth day whereas keratoconjunctivitis was observed infrequently. After 15 days the most prominent microscopic lesion was iritis. Accumulations of inflammatory cells, mainly plasma cells, were observed in the iris and ciliary body and elementary bodies were found infrequently in macrophages. Chlamydiae were recovered consistently by conjunctival swabbing from the fifth to the twenty-fourth day. The agent was present within the eye (viz. iris-ciliary body) in three of four rabbits killed at 15 days and in five of ten rabbits killed 60 days after inoculation. Chlamydiae had persisted in the cerebrum and joints as well. Although neutralizing antibody was consistently present in sera at 60 days none of the samples of aqueous humor were capable of neutralizing the agent. It is suggested that systemic chlamydial infections in the rabbit provide a model for the study of endogenous uveitis, a common ophthalmological problem.
Insights
Systemic Chlamydia psittaci infection in rabbits caused ocular lesions, including anterior uveitis and iritis. This rabbit model may help study endogenous uveitis, a common ophthalmological issue.
Area of Science:
- Ophthalmology
- Microbiology
- Veterinary Medicine
Background:
- Chlamydia psittaci is a bacterial species that can cause various infections.
- Ocular manifestations of Chlamydia psittaci infections are not fully understood in mammalian models.
- Endogenous uveitis is a significant cause of vision loss in humans.
Purpose of the Study:
- To investigate the ocular and systemic effects of Chlamydia psittaci infection in rabbits.
- To evaluate the rabbit as a model for studying endogenous uveitis.
Main Methods:
- Intravenous inoculation of albino rabbits with Chlamydia psittaci (strain M56).
- Clinical and microscopic examination of ocular lesions.
- Bacteriological culture from conjunctival swabs and ocular tissues.
- Detection of Chlamydiae in systemic tissues (cerebrum, joints).
- Serological testing for neutralizing antibodies and aqueous humor analysis.
Main Results:
- Rabbits developed ocular lesions, primarily bilateral anterior uveitis and iritis.
- Chlamydiae were consistently recovered from conjunctival swabs and ocular tissues.
- The agent persisted in the eye, cerebrum, and joints for up to 60 days.
- Systemic neutralizing antibodies were present, but aqueous humor failed to neutralize the agent.
Conclusions:
- Systemic Chlamydia psittaci infection in rabbits leads to significant ocular pathology.
- The rabbit model effectively mimics key aspects of endogenous uveitis.
- This model offers a valuable tool for researching endogenous uveitis mechanisms and treatments.