In 1994 the World Trade Organization recognized the OIE as the international standard setting body for matters dealing with animal health and zoonoses. OIE standards contained in the Terrestrial and Aquatic Animal Health Codes are measures to be used by veterinary, or in some cases, other competent authorities, of importing and exporting countries. They are useful to prevent the transfer of pathogens for both animals and humans, while avoiding unjustified sanitary trade barriers. Standards also apply for the surveillance and control of animal diseases, including zoonoses.