Fig. 4From: Comparison of a mycobacterial phage assay to detect viable Mycobacterium avium subspecies paratuberculosis with standard diagnostic modalities in cattle with naturally infected Johne diseaseA comparison of number of plaques between Johne animals that are MAP positive or negative by the phage/qPCR assay. There is no difference between the number of plaques in the two groups (Mann–Whitney two-tailed p = 0.7038)Back to article page