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Morphology and development of bovine ephemeral fever virus
Abstract:
The development of the virus of bovine ephemeral fever in mouse brain has been studied by electron microscopy. The virus particles are bullet-shaped, 70 by 145 nm, and slightly tapered toward the rounded end. The outer envelope is closely apposed to an electron-dense shell, about 12 nm thick, but no other internal structure is visible. The virus strains studied bud from the marginal membranes of neurones, but intracytoplasmic development, possibly aberrant, was also observed with one strain. Ephemeral fever virus is thus obviously a rhabdovirus, with points of resemblance to vesicular stomatitis, Flanders-Hart Park, and Kern Canyon viruses on the one hand, and to rabies virus on the other, but is structurally distinct from any of these.
Insights
Electron microscopy revealed bovine ephemeral fever virus develops in mouse brains. This rhabdovirus, while similar to others, possesses unique structural characteristics.
Area of Science:
- Virology
- Microbiology
- Neuroscience
Background:
- Bovine ephemeral fever (BEF) is an economically significant viral disease affecting cattle.
- Understanding the viral structure and replication is crucial for disease control.
Purpose of the Study:
- To investigate the ultrastructural morphology and development of bovine ephemeral fever virus in mouse brain.
- To classify the virus based on its structural characteristics.
Main Methods:
- Electron microscopy was employed to examine virus particles and their development within infected mouse brain tissue.
- Analysis of viral morphology, including shape, size, and internal structure.
Main Results:
- Virus particles are bullet-shaped (70 x 145 nm) with a tapered end and an electron-dense shell.
- Viral budding observed from neuronal marginal membranes; intracytoplasmic development noted in one strain.
- BEF virus exhibits structural similarities to other rhabdoviruses like vesicular stomatitis virus and rabies virus.
Conclusions:
- Bovine ephemeral fever virus is a rhabdovirus with distinct structural features.
- The study provides insights into the replication sites of BEF virus in neural cells.
- Structural distinctiveness suggests potential differences in pathogenesis or host interactions compared to related viruses.