Table 2. Detection of E. coli, L. monocytogenes, Salmonella spp., and S. aureus in samples collected from each production process of button mushroom in farm A, B, C and D. Salmonella spp. was detected in the deep-stacking medium (Farm C, D), 1st and 2nd turned compost (Farm D). Salmonella spp. was negative in the other samples. S. aureus was negative in all samples

Production stages	Farm A		Farm B		Farm C		Farm D
Sample type	E. coli	L. monocytogenes	E. coli	L. monocytogenes	E. coli	L. monocytogenes	E. coli	L. monocytogenes
Raw materials
Rice straw	+1)(3/3)	+(2/3)	-2)	-	-2)	-	ND	ND
Chicken manure	ND	ND	+(1/3)	ND	+1)(3/3)	ND	ND	ND
Chicken manure (undried)	-	-	-	-	-	-	ND	ND
Wheat straw	+(3/3)	+(2/3)	-	-	-	-	+(2/3)	ND
Heaped wheat straw	-	-	-	-	+(3/3)	+(2/3)	-	-
Heaped rice straw	-	-	ND	ND	-	-	-	-
Liquid fertilizer	-	-	-	-	+(3/3)	+(2/3)	-	-
Composting
Deep-stacking medium	+(3/3)	+(2/3)	+(3/3)	ND	+(2/3)	+(2/3)	+(3/3)	ND
1st turned compost	+(3/3)	+(2/3)	+(3/3)	ND	ND	ND	+(3/3)	ND
2nd turned compost	ND	+(2/3)	ND	ND	ND	ND	ND	ND
3rd turned compost	+(3/3)	ND	ND	ND	ND	ND	+(1/3)	ND
4th turned compost	+(3/3)	ND	+(3/3)	ND	ND	ND	ND	ND
Pasteurization
Pasteurized compost	ND	ND	ND	ND	ND	ND	ND	ND
Fruiting
Spawn	-	-	ND	ND	ND	ND	ND	ND
Colonized bed	ND	ND	ND	ND	ND	ND	ND	ND
Casing soil	ND	ND	ND	ND	ND	ND	+(2/3)	ND
Harvesting
Casing soil layer	+(2/3)	ND	ND	ND	+(1/3)	ND	+(1/3)	ND
Harvested mushroom	+(1/3)	ND	ND	ND	+(2/3)	ND	ND	ND
Knife	ND	ND	ND	ND	ND	ND	ND	ND
Basket	ND	ND	-	-	ND	ND	ND	ND
Glove	+(2/3)	ND	ND	ND	+(3/3)	ND	+(1/3)	ND
Packaging
Bench	ND	ND	ND	ND	ND	ND	ND	ND
Scale	-	-	ND	ND	-	ND	ND	ND
Packaged mushroom	ND	ND	ND		ND	ND	ND	ND

+, positive detection.
-, no sample.
ND, not detected sample.