A MBL concentrations in serum and B correlation between MBL concentrations and ER in blood. Chickens were uninfected or experimentally infected with ER on day 0, “naïve” and “vaccinated” groups. Sera were collected at the indicated days. Results are shown as group mean values ± 95% CI where non-overlapping CI indicate statistically significant differences. On days −13, −3 and 15 n = 13/group, on days 1, 5 and 8 n = 7/group and on days 3 and 11 n = 6/group. B Correlation between MBL concentrations in serum and growth of ER in blood from ER infected chickens on day 3 after infection, “naïve” and “vaccinated” groups. The trend line was calculated using the curve fit logarithmic mode in the software KaleidaGraph, version 4.1.0 (Synergy Software) and equation and R-value are shown in the figure. Results on bacterial counts have previously been presented in . For details see “Materials and methods” section.