Can sheep become infected by grazing pasture contaminated by cattle with Johne's disease?

Abstract
Extract Madam:- Transmission of Johne's disease (JD) under natural conditions from sheep to cattle has been demonstrated in iceland(2) but not in New Zealand.(1) The reverse, sheep becoming infected with Mycobacterium paratuberculosis of bovine origin, has been shown experimentally with large inocula (c. 5 × 109organisms/lamb),(3) but not under natural conditions. It could be important in New Zealand where sheep may be used to “clean up” pasture grazed by paratuberculous cattle.

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