All OIE listed diseases are covered, together with additional diseases. Each chapter of the Terrestrial Manual has been written and reviewed by experts of international standing and has been approved by OIE Member Countries. The diagnostic tests and protocols referred to in the Terrestrial Animal Health Code are described in detail in the Terrestrial Manual. The Terrestrial Manual is part of the standards recognised by the WTO. These publications contributed to the designation of the OIE as the reference organisation for animal health by the Marrakesh Agreement establishing the WTO.
"[...] an outstanding compilation of diagnostic procedures and a ready source of information [...] for any veterinary (or parasitologic) diagnostic laboratory [...] designed for practical use in the laboratory setting."
– Journal of Parasitology