Electron microscopic observations of mouse brain infected with Bunyamwera group arboviruses

Area of Science:

• Virology
• Microbiology
• Neuroscience

Background:

• Arboviruses, or arthropod-borne viruses, pose significant public health threats.
• The Bunyamwera virus group includes several arboviruses with diverse geographical distributions.
• Understanding the ultrastructural pathology of arbovirus infections is crucial for disease management.

Purpose of the Study:

• To investigate the ultrastructural changes in mouse brain tissue infected with three Bunyamwera group arboviruses.
• To compare the morphology and replication sites of Bunyamwera, Tensaw, and Maguari viruses within host cells.

Main Methods:

• Ultrathin sectioning of infected mouse brain tissue.
• Examination of tissue sections using transmission electron microscopy.

Main Results:

• Virus particles were observed budding from membranes into intracytoplasmic cisternae for all three viruses.
• Mature virus particles accumulated within distended cisternae and extracellular spaces.
• The three arboviruses were morphologically indistinguishable, appearing as round or oval particles (98 nm diameter) with irregular envelopes.

Conclusions:

• Bunyamwera, Tensaw, and Maguari viruses share a common replication strategy involving budding into intracytoplasmic cisternae.
• The similar morphology suggests potential shared characteristics within this arbovirus group.
• Electron microscopy is effective in visualizing arbovirus replication and accumulation in neural tissues.