from one ( 17d-england ) three types of clones were isolated , each differentiated by plaque size in vero cells and virulence for intracerebrally inoculated mice : small plaque ( sp ) and large plaque ( lp ) clones were lethal , whereas medium plaque ( mp ) clones failed to kill at doses up to 10 ( 6 ) p.f.u .
C0011389
plaque
C0016327
f