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Vaccinia virus meningitis in mice after intracerebral inoculation
Abstract:
The pathogenesis of experimental vaccinia virus infection in weanling mice after intracerebral inoculation was followed with virological, histological, and immunohistological methods. High-dose inoculation, virus spread from brain to thoracic and abdominal viscera probably by an undetected early viremia. Virus did rise to detectable levels in blood by day 5 and was found to be associated with the mononuclear cell fraction. By day 12, 30% of the animals had died and no further deaths occurred. Rise of neutralizing antibody correlated with disappearance of cell-free virus in blood, brain, and viscera. Virus was present in the brains of animals for 20 days after inoculation. This animal model may be useful to study mechanisms of persistent central nervous system virus disease relevant to man.
Insights
This study tracked vaccinia virus in mice, finding it spreads from the brain to organs and persists for 20 days. Neutralizing antibodies helped clear the virus, suggesting a model for central nervous system viral diseases.
Area of Science:
- Virology
- Immunology
- Neurology
Background:
- Vaccinia virus can cause severe disease.
- Understanding its pathogenesis in the central nervous system (CNS) is crucial.
Purpose of the Study:
- To investigate the pathogenesis of experimental vaccinia virus infection in the mouse brain.
- To establish a relevant animal model for persistent CNS viral diseases.
Main Methods:
- Intracerebral inoculation of weanling mice with vaccinia virus.
- Virological, histological, and immunohistological analyses were performed.
- Monitoring virus spread, viremia, antibody response, and survival rates.
Main Results:
- Vaccinia virus spread from the brain to visceral organs, likely via early viremia.
- Virus was detected in blood, associated with mononuclear cells, by day 5.
- Neutralizing antibodies correlated with viral clearance, and virus persisted in the brain for 20 days.
Conclusions:
- The developed mouse model effectively mimics aspects of persistent CNS viral disease.
- This model can be utilized to study the mechanisms underlying such infections.
- Findings highlight the role of viremia and antibody response in vaccinia virus pathogenesis.