FIG 7.

Clinical scores and survival curves of 2-week-old chickens infected with parental rBC and rGBT and their polymerase-associated protein gene chimeras. The clinical scores of polymerase-associated protein gene chimeras of rBC (a) and rGBT (c) and the survival curves for polymerase-associated protein gene chimeras of rBC (b) and rGBT (d) are shown in separate panels and are based on 10 birds per group. Clinical scoring: 0, normal; 1, sick; 2, paralysis/torticollis/wing drop/incoordination; 3, prostration; 4, death. The mean scores per group per day are shown.