A lab that follows the "verified" ISO 18593 knows that if they find Salmonella , it came from exactly 100 cm² of that belt—not 90, not 110.

For organizations looking for the official document, the verified ISO 18593:2018 PDF can be obtained directly through the or national bodies like BSI Knowledge and Afnor Editions . ISO 18593 - iTeh Standards

The standard doesn't just say "wipe the surface." It specifies the .