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Summary
Rabies virus infection in skunks causes spongiform lesions similar to transmissible spongiform encephalopathies. These previously unreported brain lesions in skunks highlight potential similarities in disease mechanisms and diagnostic considerations.
Area of Science:
- Neurology
- Veterinary Pathology
- Virology
Background:
- Transmissible spongiform encephalopathies (TSEs) are a group of fatal neurodegenerative diseases.
- Rabies virus is a well-known cause of encephalitis, but its association with spongiform changes was not previously reported.
Purpose of the Study:
- To investigate the neuropathological findings in striped skunks experimentally infected with street rabies virus.
- To compare the observed lesions with those of known transmissible spongiform encephalopathies.
- To determine if similar lesions occur in naturally occurring rabies cases.
Main Methods:
- Experimental infection of striped skunks with street rabies virus.
- Light and electron microscopy to examine brain tissue.
- Histopathological examination of naturally occurring rabies cases.
Main Results:
- Experimentally infected skunks developed spongiform lesions in the brain.
- These lesions, characterized by vacuoles in the neuropil and neuronal perikarya, were indistinguishable from TSE lesions.
- Similar spongiform lesions were observed in naturally occurring rabies cases, particularly affecting the thalamus and cerebral cortex.
Conclusions:
- Rabies virus infection can induce spongiform lesions similar to those seen in TSEs.
- This finding suggests potential shared pathogenetic mechanisms between rabies and TSEs.
- Spongiform changes in rabies cases necessitate their consideration in differential diagnosis.