Fig. 4From: Mycoplasma bovis antibody dynamics in naturally exposed dairy calves according to two diagnostic testsEstimated mean antibody response in serum (solid line) and 95% confidence intervals (shaded area) as measured by the in-house MilA ELISA for the herd-specific age ranges for which observations were available. Herd 1 is grey, Herd 2 is black, Herd 3 is blue and Herd 4 is green. The dashed line shows the recommended individual animal ELISA cut-off (135 AU)Back to article page