Abstract

Ultrastructural studies upon the development of coxsackievirus B-3 lesion in the olfactory bulb of the hibernating, experimentally infected adult squirrel (Citellus lateralis) revealed two or possibly three types of pathological reactions. (1) Changes, which occurred before virus replication in the brain, resembled an acute allergic reaction with extensive hemorrhages and neutrophil infiltration, fibrinoid deposits, thrombus formation, and lytic tissue breakdown in the neuropil. (2) Pathological changes resulting primarily from virus replication which succeeded the allergic reaction. (3) A reaction which coincided with and followed the virus replication and was associated with an influx of antibody-producing cells into the olfactory bulb and might prove to be the result of a delayed hypersensitivity.

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