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[Chronic measles neuroinfection in Syrian hamsters]
Abstract:
Measles neuroinfection was studied in 3-week Syrian hamsters inoculated intracerebrally with the neurovirulent Edmonston-42 strain of measles virus. The infectious virus was shown to be recoverable from the animals' brains both early after infection (up to 16 days) and at later intervals (28--63 days). At the same intervals (up to 69 days), measles antigen was demonstrated in brain impressions. All the animals under study had RNA-containing inclusions in some cells, slight cellular infiltrates and some oedema. Brains of a number of animals showed moderate inflammatory changes, dystrophic lesions in neurons, and microglial proliferation. The influence of the age and general resistance to the pattern of the course of measles neuroinfection in Syrian hamsters was demonstrated.
Insights
Measles virus can persist in hamster brains long after initial infection, causing neurological damage. Animal age and resistance impact the severity of measles neuroinfection.
Area of Science:
- Virology
- Neurology
- Immunology
Background:
- Measles virus infection can lead to serious neurological complications.
- Understanding the pathogenesis of measles neuroinfection is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the persistence and pathological effects of measles virus in the brains of Syrian hamsters.
- To examine the influence of host factors like age and resistance on measles neuroinfection.
Main Methods:
- Intracerebral inoculation of 3-week-old Syrian hamsters with a neurovirulent measles virus strain (Edmonston-42).
- Viral recovery, antigen detection, and histopathological examination of brain tissues at various time points post-infection.
Main Results:
- Infectious measles virus and viral antigen were detected in hamster brains up to 63 and 69 days post-infection, respectively.
- Histopathological findings included RNA-containing inclusions, cellular infiltrates, edema, inflammatory changes, neuronal dystrophic lesions, and microglial proliferation.
- Host factors such as age and general resistance influenced the course and severity of measles neuroinfection.
Conclusions:
- Measles virus establishes persistent infection in the central nervous system of Syrian hamsters.
- The observed neuropathology highlights the potential for chronic neurological damage.
- Host immune status and age are significant determinants in the outcome of measles neuroinfection.