Figure 5

Colony counts in BM-HPC cultures from biopsies taken at 24 hours and 6 days post-colostral challenge. Calves W and Y are challenge animals, calves X and Z are controls. At 24 hours, no difference is observed between animals/groups in terms of colony counts, though morphological differences were observed (see text and figure 3). At 6 days post-colostral challenge all three lineages are markedly reduced in both challenged calves (W and Y) as compared to the control animals (X and Z). No CFU-E were observed in either challenged animal at 6 days.