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Ciliostasis (A) and histopathology (B) scores from the trachea of SPF chicks challenged and euthanized at 42 and 47 days of age, respectively (Exp. 1). NONVAC/M41 (non-vaccinated and challenged with M-41, n = 12), VAC/M41 (vaccinated and challenged with M-41, n = 12), NONVAC/PR03 (non-vaccinated and challenged with IBVPR03, n = 10), and VAC/PR03 (vaccinated and challenged with IBVPR03, n = 11). NS, non-significant (P > 0.05)
