Abstract
Encephalomyocarditis (EMC) virus replicates to high titre in permissive mouse kidney (MKS) cells but poorly in monkey kidney (CV1) cells. The permissiveness of monkey-mouse hybrid cells varies according to their chromosomal content.
In monkey cells, the synthesis of both single-stranded and double-stranded virus RNA is restricted; in semi-permissive hybrid clones, the double-stranded RNA is synthesized normally, whereas the synthesis of the single-stranded RNA is inhibited. Thus, it seems that more than one restrictive event is responsible for the low permissiveness of monkey cells to EMC virus.