The results show that the predominant serotypes are O78 (35.14%), O1(18.92%), O2(13.51%) and all isolates are multi-resistance.The antibiotic resistance species vary from 3 to 14.

• 结果表明：河南省鸡致病性大肠杆菌的血清型种类众多，以O78、O1、O2为优势血清型，分别占定型菌株的35.；14%25、18