We wanted to test our hypothesis that the gp33 epitope
would also be disrupted in most of the viral genomes recovered
from nonfluorescent plaques from the brains of protected animals.
Thus, we analyzed the portions of the genomes encoding
the ORF4a/gp33/EGFP fusion proteins from viruses isolated
from both fluorescent and nonfluorescent plaques and from
both protected and unprotected animals.