The Journal of Immunology, Vol 159, Issue 4 1876-1884, Copyright © 1997 by American Association of Immunologists

ARTICLES

Virus dissemination through the brain parenchyma without immunologic control

PG Stevenson, S Freeman, CR Bangham and S Hawke
Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom.

After inoculation into the cerebrospinal fluid, the neurovirulent influenza virus A/WSN caused a rapidly progressive encephalitis that was uniformly fatal within 8 days. After inoculation into the brain parenchyma, the same virus replicated for 7 to 20 days without causing clinical illness, but when infection reached the cerebrospinal fluid, encephalitis was lethal within a further 6 days. As the virus spread through the brain parenchyma, there was intense intracerebral inflammation, with up-regulation of MHC class I and MHC class II expression and recruitment of CD44(high) CD49d(high) T cells. However, this was not associated with antiviral Ab production, and the infiltrating cells, unlike primed A/WSN-specific T cells, did not eliminate the virus in vivo or show evidence of virus recognition in vitro. Thus, a neurovirulent virus was able to disseminate widely through the brain parenchyma and induce considerable intracerebral inflammation without eliciting protective immunity.

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