IL1B and infection: IL-6, IL-1β, and IL-10 mRNA expression did not differ significantly (p > 0.05) in chickens treated with the bacteriophage cocktail the day before infection with S. Enteritidis (Group P) on days 4 and 10 compared to the control group; however, IL-6 and IL-10 mRNA expression were increased (p < 0.05) and IL-1β expression was slightly increased (p = 0.08) on day 7.