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Daily total clinical sign scores of chickens postchallenge. One-day-old SPF chickens were vaccinated with rLS/ILTV-gB, rLS/ILTV-gD, rLS-GFP, or PBS and challenged with the virulent ILTV strain 63140/C/08/BR at 21 (a) or 28 (b) days postvaccination. The birds were examined daily for clinical signs, and the total scores from each group of birds were plotted.
