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MAP: helping farmers to make informed decisions by A. Cook (VR, October 12, 2013, vol 173, pp 341-342; doi: 10.1136/vr.f6078). The photograph of a cow with chronic Johne's disease was incorrectly attributed to the AHVLA. The photograph was actually taken by Michael T. Collins of the University of Wisconsin. The error is regretted.

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