Summary
A small plaque mutant with reduced neurovirulence in newborn mice was obtained from Edmonston strain measles virus after propagation for 5 months in NIH3T3 cells. It retained the antigenicity of the parental virus and tended to induce higher neutralizing antibody titers in the adult BALB/c mice. The intracerebral (but not intraperitoneal) inoculation of the live mutant virus one day before prevented the newborn BALB/c mice from encephalitis caused by the intracerebral challenge with the parental strain at a dose of 10–20 LD50. The intracerebral inoculation with the mutant virus whose replication capacity was inactivated by UV-irradiation was ineffective. The protection was not attributed to interferons nor to viral interference. The mechanism remains unknown.
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Received April 9, 1997 Accepted June 28, 1997
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Sakae, H., Kohase, M., Kurata, T. et al. Isolation of a measles virus variant: protection of newbornmice from measles encephalitis by 24 h prior intracerebralinoculation with the variant. Arch. Virol. 142, 1937–1952 (1997). https://doi.org/10.1007/s007050050212
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DOI: https://doi.org/10.1007/s007050050212