Means a group of units sharing a common defined characteristic.
Synonyms :
Source: World Organisation for Animal Health (OIE) , [online]. 15th edition, 2006. Paris, France: World Organisation for Animal Health (OIE), 2006. [cited 4 December 2006]
Source URL:
Terrestrial Animal Health Code
Copyright: World Organisation for Animal Health (OIE)
Date of entry: 14/12/2006