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. 2011 Jan 7;29(8):1576–1582. doi: 10.1016/j.vaccine.2010.12.102

Fig. 1.

Fig. 1

Protection percentages of chickens following immunization with recombinant fowlpox virus co-expressing the infectious bronchitis virus (IBV) S1 gene and the chicken interferon-γ gene at week 0 and challenged with 0.2 mL of allantoic fluid containing 10,000 EID50 of IBV strains LX4, LHLJ04XI, LHB, LSC99I and LTJ95I at week 3 post-vaccination. The chickens were observed daily for clinical symptoms. The clinical symptoms of morbid chicken included apathy, cough, mouth breathing and extension of the neck.