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. 1991 May 1;88(9):3852–3856. doi: 10.1073/pnas.88.9.3852

Direct spread of reovirus from the intestinal lumen to the central nervous system through vagal autonomic nerve fibers.

L A Morrison 1, R L Sidman 1, B N Fields 1
PMCID: PMC51551  PMID: 1850838

Abstract

A crucial event in the pathogenesis of systemic enteric virus infections is entry of virus into the nervous system. Whether enteric virus spreads from the intestinal tract to the central nervous system through nerves or through the bloodstream was examined using a serotype 3 reovirus strain. After peroral inoculation of newborn mice with reovirus, serial histologic sections of small intestine, brain and spinal cord were prepared and stained by immunoperoxidase to detect viral antigen. Three days after inoculation, viral antigen was observed in mononuclear cells of ileal Peyer's patches and in neurons of the adjacent myenteric plexus. Infection first appeared in the central nervous system 1-2 days later in neurons of the dorsal motor nucleus of the vagus nerve. Endothelial cells, meninges, choroid plexus, hypothalamus, and area postrema were not infected, indicating neural rather than bloodborne spread from the intestine. Staining of neurons in the dorsal motor nucleus of the vagus nerve depended on the route of virus inoculation and was independent of the amount of virus in the bloodstream. These results demonstrate that an enteric virus entering a host from the intestinal lumen can spread to the central nervous system through nerve fiber innervating the intestine.

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