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Protective efficacy of the recombinant viruses against lethal DEV challenge. Groups of 6 to 10 ducks were vaccinated intramuscularly with one (A, B, and C) (n = 10) or two doses (D) (n = 6) of the recombinant DEVs and challenged with lethal DEV at 3 days (A), 1 week (B), 3 weeks (C), or 10 weeks (D) postvaccination (p.v.). Ducks were monitored daily for 2 weeks after challenge.
