An outbreak of polio-encephalomalacia in cobalt-deficient sheep |
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| Authors: | W.J. Hartley M.R.C.V.S. Joan C. Kater B.V.Sc. E.D. Andrews M.Sc. A.N.Z.I.C. |
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| Affiliation: | Wallaceville Animal Research Station , Department of Agriculture , Private Bag, Wellington |
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| Abstract: | Extract A great deal of evidence has now accumulated that immunity to helminth infection is acquired following natural exposure. Although this immunity is not absolute, animals that have been exposed to infection and survived are able to tolerate a much heavier intake of infective larvae than animals that have never been exposed. |
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