Currently, the OIE Terrestrial Animal Health Code (Terrestrial Code) defines “avian influenza” as an infection of
poultry caused by any influenza A virus with high pathogenicity (HPAI), and by H5 and H7 subtypes with low
pathogenicity (H5/H7 LPAI). In previous versions of the Terrestrial Code and Manual of Diagnostic Tests and
Vaccines for Terrestrial Animals (Terrestrial Manual), HPAI and H5/H7 LPAI viruses were termed “notifiable avian
influenza” viruses, but because of inconsistences with usage of the term “notifiable” with other diseases in the
Terrestrial Code, the terms “notifiable avian influenza”, “high pathogenicity notifiable avian influenza” and “low
pathogenicity notifiable avian influenza” have been removed from the Terrestrial Code and the Terrestrial Manual.
To avoid confusion with the scientific use of “avian influenza”, which began in 1955, in this Terrestrial Manual the