Abstract

Conclusion1) Col-SK, MM, High Lansing and EMC virus, harvested from remote rodent passages, produce typical poliomyelitis in m-tracerebrally infected cynomolgus monkeys. 2) Two strains of highly virulent Theiler virus, GDVII and FA, are non-pathogenic for cynomolgus monkeys, 3) The Col-SK-MM group of virus can be carried in cynomolgus monkeys only for a limited number of passages. 4) Judging from serological and biological characteristics, monkey passage fails to bring about a permanent conversion of Col-SK virus into Y-SK virus.

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