Gabbedy B J, Richards R B
Aust Vet J. 1977 Jan;53(1):36-8. doi: 10.1111/j.1751-0813.1977.tb15817.x.
Polioencephalomalacia was confirmed histologically in Western Australia in sheep from 100 farms and cattle from 14 farms during the period 1965 to 1974. The condition affected sheep and cattle in good physical condition of all ages, throughout the year. Mortality rates in sheep flocks ranged from less than 1% to in excess of 10% and occurred under a number of management systems.
1965年至1974年期间，在西澳大利亚州，经组织学检查确诊，100个农场的绵羊和14个农场的牛患有脑灰质软化症。这种病症全年都有发生，影响各个年龄段身体状况良好的绵羊和牛。绵羊群的死亡率从不到1%到超过10%不等，且在多种管理系统下都会出现。
