Mean WBCs counts during the acute stage of infection.

<p>a) Mean WBCs ± SEM were plotted as a percentage of baseline counts in group A (low dose inoculum; only those animals that exhibited fever and/or positive by either RT-PCR or virus isolation were included e.g. 7 out of 12 calves) and group B (medium dose inoculum). WBC counts are shown for the acute phase of infection in group C (high dose inoculum). b) Mean WBCs ± SEM were plotted as percentages of baseline counts over the duration of the study, namely 60 dpi for group B (medium dose) and 71 dpi for group D (medium dose with DMS administered at time of inoculation).