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Box plots showing the iohexol serum concentrations on d 20 (A) and d 21 (B). The strains (A, B, C) of the challenge group are illustrated in different colors (blue = A = Hungary field strains, green = B = Netherlands field strains, yellow = C = Poland field strains). The iohexol concentration was significantly higher in the challenge groups compared to the control group on d 20 (P = 0.0188) and d 21 (P = 0.0031).
