On april 1999 two pig farms broke out an infectious disease which was charaterized by acuteness, fever,high mortality, hemorrhage of lymphatic node, kidney and spleen, ulcers of caecum and ileum.

• 1999年5月，惠水及印江县养猪场爆发一种以急性经过、高热稽留、死亡率高、淋巴结及肾脾出血性变化显著、盲肠末端及回盲瓣附近有钮扣状溃疡等为特征的侍染病。