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(A and B) Bursal load of IBDV (corrected 40-CT ± the standard errors) (A) and bursal damage scores (B) at various times postinfection with virulent (F52/70) IBDV. C = control, uninfected; I = infected; 6 = resistant line 61 chickens; BrL = susceptible Brown Leghorn chickens. n = 9 birds per group per time point.
