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Diseased and dead chickens of different groups challenged with IBV HN99 strain. (A) Diseased chickens of different groups. Presence of one of the following can be used to judge morbidity: (1) coughing; (2) nasal discharge; (3) wheezing or dyspnea; (4) swinging of the head; (5) feathers erected, dullness. (B) The cumulative mortalities of different groups. Statistically significant differences (P < 0.05) are indicated by * (compared with rFPV-S1 or rFPV-S1/IL18).
