Under investigation - A person who has been referred to the public health service for investigation of possible HPAI infection.

Suspect - A clinically compatible illness in a person who, in the 7 days before the onset of symptoms, did one or more of the following:

• was in an area where HPAI infections (in animals or humans) have been suspected or confirmed in the last month
• consumed raw or undercooked meat from known source animals in an area where HPAI infections have been suspected or confirmed in the last month
• had close contact with suspected or confirmed HPAI-infected animals
• was working in a laboratory that is handling samples from people or animals that are suspected of HPAI infection.

Probable - A clinically compatible illness with a strong epidemiological link to a confirmed case or defined cluster.  
Confirmed - A person with laboratory-confirmed HPAI infection.

Not a case - A case that has been investigated, and subsequently has been shown not to meet the case definition.

For more information refer to the Highly Pathogenic Avian Influenza section of the Communicable Disease Control Manual.