Table 1.

Antigens used in testing.

Virus	Isolated and passaged/Antigen type	Collaborative study
IVR-180 (H1N1)pdm09	Egg/HGR	HAI/MN
X-263B (H3N2)	Egg/HGR	HAI/MN
BX-35 (B Victoria)	Egg/HGR	HAI/MN
BX-59A (B Yamagata)	Egg/HGR	HAI/MN
A/Michigan/45/2015 (H1N1)	Egg/WT	HAI
A/Hong Kong/4801/2014 (H3N2)	Egg/WT	HAI
B/Brisbane/60/2008 (B Victoria)	Egg/WT	HAI
B/Phuket/3073/2013 (B Yamagata)	Egg/WT	HAI
A/Michigan/45/2014 (H1N1)	Cell/WT	HAI
A/Yamaguchi/34/2016 (H3N2)	Cell/WT	HAI/MN
B/Texas/02/2013 (B Victoria)	Cell/WT	HAI
B/Phuket/3073/2013 (B Yamagata)	Cell/WT	HAI

HGR, High Growth Reassortant; WT, wild type; HAI, haemagglutination inhibition assay; MN, microneutralisation assay.