IBD和ND混合感染伴发大肠杆菌病的诊断

Studies on the Diagnosis of Newcastle Disease andInfectious Bursal Disease and Colibacillosis in a Chicken farm

以流行病学、临床症状、病理变化和实验室诊断等方法确诊了１９９０年６～９月在河南省某肉鸡场暴发的鸡传染病为鸡新城疫（ＮＤ）和鸡传染性法氏囊病（ＩＢＤ）混合感染，并伴发了大肠杆菌病。

By epidemiology, clinical signs, pathology and laboratory diagnosis, we cameto the conclusion that the outbreak of the chicken disease at HENAN province in 1990were Newcastie Disease and Infectious Barsal Disease and Colibacillosis. In this paper,we also discussed the mot cause of these diseases and how to prevente and control thesediseases.