Figure 4From: Experimental co-infection of variant infectious bursal disease virus and fowl adenovirus serotype 4 increases mortality and reduces immune response in chickensCytokine expression levels in the spleen of infected chickens. Chickens were inoculated with variant IBDV-ZD-2018–1 and/or FAdV-4-HB1501, and the mRNA levels of cytokines in the spleen were measured. a,bBars with no common superscript are significantly different (p < 0.05).Back to article page