Temperature, mortality, and gene expression in NDV-infected chickens after anti-IL-1β neutralizing antibody treatment.A Temperature change in the chickens. B Mortality of SPF chickens after NDV infection and anti-IL-1β neutralizing antibody treatment. C Immunohistochemical detection of IL-1β in the lungs and glandular stomach of chickens. Seven chickens were observed for survival over 10 days. The data are expressed as percent total survival. Temperature was measured once daily.