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. 2009 May 15:200–294. doi: 10.1016/B978-141603137-6.50009-0

Figure 6-60.

Figure 6-60

A pair of 18-month-old Holstein heifers with advanced Johne's disease. These heifers were representative of an age-grouped epidemic involving 12- to 24-month-old heifers on a single farm. This would imply extremely heavy environmental contamination with M. paratuberculosis.