Table 1 Surveillance results of environmental AIVs in Fujian Province, during 2013–2017

Surveillance city

Fuzhou

819

157

(19.17)

<0.001

540.835

7

(0.85)

<0.001

101.033

Xiamen

1060

594

(56.04)

63

(5.94)

Quanzhou

1234

369

(29.90)

51

(4.13)

Zhangzhou

589

33

(5.60)

1

(0.17)

Sanming

600

219

(36.50)

59

(9.83)

Nanping

601

193

(32.11)

27

(4.49)

Sample site

LPMs

3785

1500

(39.63)

<0.001*

199

(5.26)

<0.001*

Poultry farms

275

1

(0.36)

0

(0.00)

Poultry households

701

48

(6.85)

4

(0.57)

Poultry slaughter factories

133

16

(12.03)

5

(3.76)

Others

9

0

(0.00)

0

(0.00)

Sample

Fresh fecal

1696

477

(28.13)

<0.001*

55

(3.24)

<0.001*

Cage surface

1245

401

(32.21)

35

(2.81)

Poultry drinking water

788

252

(31.98)

39

(4.95)

Cleaning poultry sewage

635

249

(39.21)

38

(5.98)

Poultry chopping board surface

535

184

(34.39)

41

(7.66)

Others

4

2

(50.00)

0

(0.00)

Season

Spring

1448

555

(38.33)

<0.001

90.916

78

(5.39)

<0.001

48.174

Summer

1060

284

(26.79)

20

(1.89)

Autumn

975

218

(22.36)

19

(1.95)

Winter

1420

508

(35.77)

91

(6.41)

Total

4903

1565

(31.92)

208

(4.24)