Figure 2From: Calves shedding Mycobacterium avium subspecies paratuberculosis are common on infected dairy farms Age-specific proportions of cattle excreting Mycobacterium avium subsp. paratuberculosis in their feces. IS900 and F57 qPCR and culture were conducted on 13 farms (n = 1741; mo = month, y = year).Back to article page