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Tuberculosis can be spread among cattle when they inhale the Mycobacterium bovis bacilli discharged from an infected cow, or when they drink water or eat pasture contaminated by infected dung. The bacilli may also enter the body through wounds or scratches. The disease develops over a number of years and results in weakness, coughing and weight loss. Advanced stages of the disease, seen in this cow, are now uncommon in New Zealand.
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Reference: P. J. McCann, Tuberculosis of farm animals. Wellington: Department of Agriculture, 1952 (S-L 872-11)
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.