某猪场断奶腹泻仔猪致病菌的调查

湖北省某规模化猪场断奶腹泻仔猪180头，尸体解剖观察到部分组织有干酪样病变，全身浆膜有不同程度的出血点，肠壁厚薄不均，弹力下降。随机选取腹泻严重的猪10头、正常猪3头，对肠道内容物进行分离培养，并生化鉴定得7类菌属。它们依次为伤寒沙门氏菌、产气杆菌、埃希氏菌、克雷伯菌属肺炎杆菌、变形杆菌属普通变形杆菌、志贺菌属、弗劳氏柠檬酸菌。所占比例分别为：87.5%、57.1%、100%、28.6%、28.6%、14.3%、28.6%。小鼠致病性试验，各菌属的致死率分别为100%、60%、10%、20%、40%、60%、80%。结果表明：引起该猪场断奶仔猪腹泻的优势病原菌为伤寒沙门氏菌。 

Investigation of Pathogenic Bacteria in Weaning Brash Piglets in Field

In hubei province,there were 180 piglets diarrheaed in certain pig field.The dead weaning brash piglets were autopsy and observed that some tissue occured cheese pathological change.And plasma membrane had different level bleeding point all over the body.We found that bowels wall was thickness and elasticity decreased.Then selected randomly serious weaning brash piglets were 10 and normal piglets were 3.From their content of intestinal tract, 7 strain bacteria were isolated and cultured.In order biochemistry identited they were salmonella typhisuis,Bacterium aerogenes,Escherichia,pneumonia bacillus,Bacterium vulgare of Proteus,Shigella.The percentage in piglets diarrheaed were 87.5%,57.1%,100%,28.6%,28.6%,14.3%,28.6%.Through pathogenicity testing on mouse the difference of pathopoiesis were 100%,.60%,10%,20%,40%,60%,80%.It was concluded that salmonella typhis was the main pathogenic bacteria in the field.