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Figure  1 | Veterinary Research

Figure  1

From: Pathogenic characteristics of a QX-like infectious bronchitis virus strain SD in chickens exposed at different ages and protective efficacy of combining live homologous and heterologous vaccination

Figure  1

Proportion and duration of clinical signs in chickens of different groups after infection with IBV strain SD. A Group 1, chickens were infected with 106.0 EID50 of IBV strain SD at 2-weeks old. B Group 2, chickens were infected with 106.0 EID50 of IBV strain SD at 3-weeks old. C Group 3, chickens were infected with 106.0 EID50 of IBV strain SD at 8-weeks old. D Group 4, chickens were infected with 106.0 EID50 of IBV strain SD at 18-weeks old. E Group 5, chickens were infected with 106.0 EID50 of IBV strain SD at 22-weeks old.

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Veterinary Research

ISSN: 1297-9716