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[Confusional form of Chlamydia psittaci encephalitis. Diagnostic value of microimmunofluorescence. A case]
Abstract:
A rare case of Chlamydia psittaci encephalitis is reported. The disease started with anxiety, agitation and fever (38.5 degrees C) accompanied with hallucinations and regressed within 48 hours, but a confusional syndrome persisted for 9 days. Alterations in the blood-brain barrier with low CSF protein levels and signs of lateralization could be demonstrated. The inflammatory syndrome remained discrete. The cause of the disease was disclosed by serology and epidemiological investigations. The spontaneous outcome was favourable, thus confirming that neurological forms of psittacosis are benign. This case shows that microimmunofluorescence is more sensitive than the complement fixation test and that significant levels of antibodies directed against Chlamydia psittaci may persist for almost one year in the absence of treatment.
Insights
A rare case of Chlamydia psittaci encephalitis, a neurological form of psittacosis, presented with anxiety, agitation, and fever. This study confirms neurological psittacosis is typically benign and highlights diagnostic test sensitivities.
Area of Science:
- Neurology
- Infectious Diseases
- Ophthalmology
Background:
- Chlamydia psittaci, an obligate intracellular bacterium, can cause psittacosis, a zoonotic disease.
- Neurological manifestations of psittacosis are rare but can occur.
Observation:
- A patient presented with acute anxiety, agitation, fever, and hallucinations, followed by a persistent confusional syndrome.
- Cerebrospinal fluid analysis revealed altered blood-brain barrier permeability with low protein levels and signs of lateralization.
Findings:
- Serological and epidemiological investigations confirmed Chlamydia psittaci as the causative agent.
- Microimmunofluorescence testing demonstrated higher sensitivity compared to the complement fixation test for detecting antibodies.
- Antibody levels against Chlamydia psittaci remained elevated for nearly a year without treatment.
Implications:
- Neurological psittacosis can have a favorable prognosis, suggesting benign outcomes for these rare neurological presentations.
- Microimmunofluorescence is a more sensitive diagnostic tool for Chlamydia psittaci infections than complement fixation.
- Persistent antibody levels highlight the importance of long-term monitoring and understanding immune responses in Chlamydia psittaci infections.