Place

No. flocks

Total No. samples

No. E.coli isolates

Distribution of O serotype

Shaanxi

18

310

165

O1, O2, O6, O14, O16, O17, O22, O38, O62, O70, O74, O78, O85, O88, O93, O98, O101, O114, O115, O123, O127, O128, O124, O161

Henan

12

238

133

Hebei

9

255

145

Shanxi

11

242

138

Total

50

1045

581