'''Sporadic bovine leucosis''' is seen in young animals and causes thymic and cutaneous lymphosarcoma. These animals are usually seronegative for [[Bovine Leukosis|EBL]] and so the pathogenesis is thought to be different to enzootic bovine leukosis.
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'''Sporadic bovine leucosis''' is seen in young animals and causes thymic and cutaneous lymphosarcoma. These animals are usually seronegative for [[Bovine Leukosis|BLV]] and so the pathogenesis is thought to be different to enzootic bovine leukosis.