Reference: WHO Guidelines for Global Surveillance of Influenza A/H5. February 6, 2004 (from WHO website: http://www.who.int/csr/disease/avian_influenza/guidelines/globalsurveillance.pdf)
Confirmed case definition for influenza A/H5
A confirmed case of influenza A/H5 infection is an individual, alive or deceased, in whom laboratory testing demonstrates one or more of the following:
The laboratory tests for the diagnosis of influenza A/H5 infection included in the case definition are considered the standard for the identification of these viruses.