The epidemiology of the disease in the province was characterized by high morbidities in piglets below 20 days old with a high death rate as high as above 95%, and little morbidity in weaned pigs.

• 并通过此次调查了解到我省该病流行的特点：20日龄前仔猪发病率高，其死亡率高达95%25以上，断奶仔猪很少发病；