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Virus recovery from tracheal scraping suspensions of SPF chicks from the following groups: non-vaccinated and challenged with M-41 (NONVAC/M41), vaccinated and challenged with M-41 (VAC/M41), non-vaccinated and challenged with IBVPR03 (NONVAC/PR03), and vaccinated and challenged with IBVPR03 (VAC/PR03). NS, non-significant (P > 0.05)
