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IgGT, IgGa, and IgGb responses to each of the seven Vap proteins (VapA and VapC to VapH) by adult horses, clinically normal foals, and pneumonic foals. Significant differences (P ≤ 0.05 by Student's t test) between the adult and pneumonic group are indicated by a, those between the pneumonic and clinically normal foal groups are indicated by b, and those between the adult and clinically normal group are indicated by c.
