Table 5 Evaluation index system for biosecurity prevention and control on farms

External biosafety

Site selection

Distance (km) from nearest farm

See Table 4

Distance (km) from nearest residential area

Distance (km) from main traffic arteries

Are there natural barriers around the farm (rivers, mountains, farmland)?

179

67

Biological control

Are there devices to prevent birds from entering the farm?

145

101

Are there devices to prevent rodents from entering the farm?

163

83

Are there devices to prevent insects from entering the farm? (such as ticks, mosquitoes, and flies)

151

95

Material monitoring

Will feed be disinfected when it comes into play?

193

53

Is the introduction of frozen semen tested for pathogens?

32

214

And personnel and vehicle management

Can external personnel and vehicles freely enter the farm?

22

224

Are there vehicles entering the decontamination site?

205

41

Is the means of transport special or exclusive?

176

70

Internal biosafety

Cleaning and disinfection

Road disinfection frequency

See Additional file 1

Disinfection frequency of pen house

Is there any decontamination operation in the workers’ approach area? (bathing, disinfecting, changing clothes and boots, etc.)

230

16

Epidemic prevention and control

Does the farm have an immunization record?

216

30

Is there a resident veterinarian?

85

161

Feed and drinking water

Whether feed uses kitchen waste (swill)

7

239

Whether the water source is detected

109

137

Whether drinking water is disinfected

91

155

Pig herd management

Are fattening pigs all in and out?

82

164

Are different pig groups managed by districts?

201

45

Infrastructure allocation

Are clean roads and sewage roads separated in the field?

204

42

Is there a transit site in the inner and outer sites?

173

73