Abstract
DA strain of Theiler's murine encephalomyelitis virus produces a persistent demyelinating infection. We previously produced escape mutant viruses that are resistant to a neutralizing monoclonal antibody and have a mutation in VP1 amino acid residue 268 in a neutralization site (Y. Ohara, A. Senkowski, J. Fu, L. Klaman, J. Goodall, M. Toth, and R.P. Roos, J. Virol. 62:3527-3529, 1988). In contrast to wild-type DA strain, these escape mutants produce little if any demyelinating disease after inoculation into weanling mice.
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