Table 3.

Laboratory test results of environmental samples during an outbreak, C County, Shandong, August 2021

	Sample type	Sample source	PCR results	Bacterial culture results
1–3	Environmental samples	Wang’s cattle farm sewage, the ground where cattle used to be slaughtered, cattle trucks daub sample	+	2 strains of bacteria (cattle trucks daub sample)
4–13	Environmental samples	Case 8’s yard ground where cattle used to be slaughtered, sewage, cold storage, etc	+	1 strain of bacteria (yard ground)
14	Beef	A beef sample from case 8's cold storage	+	/
15–26	Environmental samples	Case 7’syard ground where cattle used to be slaughtered, cow saws, cold storage and butcher shop environment, etc	+	2 strains of bacteria(cow saws, Inner side wall of cold storage)
27	Environmental samples	Plate of barbecue shops where Case 7’s meat was sold	+	/
28	Environmental samples	Case 6’s yard ground	+	1 strain of bacteria
29–33	Environmental samples	Case 6’s butcher shop floors, door handles, meat hooks, bone saws, and meat carts	+	/
34	Environmental samples	Case 11’s cattle slaughter knife	+	2 strains of bacteria