A single nucleotide change in the mumps virus F gene affects virus fusogenicity in vitro and virulence in vivo.

Abstract excerpt

Mumps virus is highly neurotropic, with evidence of infection of the central nervous system in more than half of clinical cases. In the prevaccine era, mumps was a major cause of viral meningitis in most developed countries. Despite efforts to attenuate the virus, some mumps vaccines have retained virulence properties and have caused aseptic meningitis in vaccinees, resulting in public resistance to vaccination...

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