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Cytokine expression analyses of canine distemper virus (CDV)-infected lung tissue. IL = interleukin; TNF-α = tumor necrosis factor alpha; TGF-β = transforming growth factor beta; IFN-γ = interferon gamma. Groups: 1 = non-infected control lungs; 2 = acute CDV infection; box and whisker plots display median and quartiles with maximum and minimum values. Significant differences (p ≤ 0.05, Kruskal–Wallis H test) are labeled by asterisks.
