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* Anthrax and haemorrhagic septicaemia are diseases that develop very rapidly and produce severe clinical signs or death. * Papilloma virus (causing warts on the skin of cattle) is a disease that produces mild signs in many animals with little impact on health or productivity. * Bovine Johnes disease (BJD) is a disease which develops very slowly, it causes chronic diarrhoea and wasting in older cattle. It takes a long time for BJD to these produce serious effects, the cattle are infected when they are very young but do not show signs till they are older. BJD produces the same signs as a cow with an intestinal worm infection.}}
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