Fig. 6.

Survival and clinical conditions of vaccinated chickens after challenge. (A) Mortality and (B) morbidity curves of two-dose immunization after challenge with wild-type NDV. (C) Weight gain of each immunization group after challenge. Error bars indicate SEM data averaged from eight chickens per group. (D) The rectal temperature of chickens after challenge. (E) HI antibody titers after challenge. Error bars indicate SEM data. (F) Photographs of the duodenum and stomach in different groups. (G) H&E staining of glandular stomach and spleen.