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Mean H3N8 antibody level of weanlings, yearlings, broodmares, teasers, horses in training and non‐Thoroughbreds. Comparison of mean antibody levels for example, 2, 3, 4, 5, 6* = mean H3N8 antibody level of weanlings is significantly different from that of the yearlings, broodmares, teasers, horses in training and non‐Thoroughbreds (P < 0·01).
