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JAPANESE B ENCEPHALITIS VIRUS: ITS DIFFERENTIATION FROM ST. LOUIS ENCEPHALITIS VIRUS AND RELATIONSHIP TO LOUPING ILL

L T Webster1

  • 1Laboratories of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine
|October 30, 2009
PubMed

Insights

Japanese B encephalitis virus is virulent in mice, monkeys, and sheep. It differs from St. Louis virus but shares similarities with louping ill virus, though serologically distinct.

Area of Science:

  • Virology
  • Neuroscience
  • Epidemiology

Background:

  • Japanese B encephalitis virus (JBEV) is a significant cause of viral encephalitis.
  • Previous reports indicated JBEV's virulence, necessitating further investigation.

Purpose of the Study:

  • To confirm and expand upon the reported virulence of JBEV in animal models.
  • To differentiate JBEV from other related encephalitic viruses.
  • To discuss the characteristics and transmission of JBEV and similar human encephalitides.

Main Methods:

  • Virulence studies in mice, monkeys, and sheep using various inoculation routes (intranasal, intracerebral).
  • Comparative analysis of JBEV with St. Louis virus and louping ill virus based on animal reactions.
  • Serological testing to establish distinctness.

Main Results:

  • JBEV confirmed as virulent in mice and monkeys.
  • Demonstrated virulence in monkeys via intranasal instillation and in sheep via intracerebral/intranasal routes.
  • JBEV differentiated from St. Louis virus and showed similarities to louping ill virus in animal models, but was serologically distinct.

Conclusions:

  • JBEV exhibits significant virulence across multiple animal species.
  • JBEV is antigenically distinct from St. Louis virus.
  • Understanding JBEV's characteristics is crucial for differentiating and managing primary virus encephalitides.

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