There are 10 carring SLT2+eaeA+hly,and 1 carring eaeA+hly1, in a total of 11 O157:H7. No O157:H7 was delected in the 69 samples from source water which includs both low water period and high water period.

• 11株 O15 7:H7菌株毒力基因测定 ,携带 SL T2 +eae A+hly10株 ,携带 eae A+hly1株。