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The DA strain of Theiler's virus persists in the central nervous systems of mice and causes chronic inflammation and demyelination. The GDVII strain, on the other hand, causes an acute encephalitis that kills the host in a matter of days. We constructed a series of recombinants between two infectious cDNA clones of the genomes of DA and GDVII viruses. Analysis of the phenotypes of the recombinant viruses yielded the following results. (i) Determinants of persistence and demyelination are found only in the VP1 capsid protein of DA virus. (ii) Whereas the VP1 capsid protein of DA virus is able to fully attenuate the neurovirulence of GDVII virus and to allow the chimeric virus to persist and demyelinate, the VP1 capsid protein of GDVII virus is unable to render DA virus neurovirulent. (iii) The mere attenuation of the neurovirulence of GDVII virus does not allow it to persist and demyelinate.

Determinants of persistence and demyelination of the DA strain of Theiler's virus are found only in the VP1 gene