Table 1 The origin and location of 434 non-O157 STEC isolates used in this study.

From: Genetic diversity of the enterohaemolysin gene (ehxA) in non-O157 Shiga toxin-producing Escherichia coli strains in China

Source

Location

Sampling year

No. of samples

No. of stx-positive

No of ehxA-positive (%)*

Goat

Henan

2009

N/A

28

12 (42.9%)

Yak

Qinghai

2012

728

128

66 (51.6%)

Plateau Pika

Qinghai

2012, 2012, 2015

1116

22

15 (68.2%)

Marmots

Qinghai

2012, 2013

335

8

4 (50.0%)

Tibetan antelope

Qinghai

2014

505

5

4 (80.0%)

Pig

Chongqing, Beijing, Guizhou, Shandong, Heilongjiang

2011, 2012, 2013, 2015

1181

135

1 (0.7%)

Cattle/Cow

Shandong, Heilongjiang

2009, 2013, 2015

605

14

6 (42.9%)

Raw meat

Beijing, Sichuan

2013, 2014

853

60

20 (33.3%)

Diarrhoeal patient

Henan, Shenzhen, Shanghai, Sichuan

2010, 2012, 2013, 2014, 2016

N/A

30

9 (33.3%)

Healthy carrier

Qinghai, Shenzhen

2013, 2014

2058

4

1 (25.0%)

Total

   

434

138 (31.8%)

  1. N/A: The number of samples was not applicable. *The percentage of ehxA gene was detected in the stx-positive strains.