Global influenza surveillance and response system (GISRS) https://www.who.int/influenza/gisrs_laboratory/en/
Loboratory methodologies for testing the antiviral susceptibility of influenza virus. https://www.who.int/influenza/gisrs_laboratory/antiviral_susceptibility/en/
WHO : Meetings of the WHO working group on surveillance of influenza antiviral susceptibility-Geneva, November 2011 and June 2012. Wkly Epidemiol Rec 2012 ; 87 : 369-374.