Table 1.

Percentages of circulating A/H3N2 viruses which showed ≤ 2-fold and 4-fold differences (HI assay) to cell- and egg-propagated reference virus titres for the February 2016–February 2017 influenza seasons.

Influenza Season	Reference Virus	≤2-Fold	4-Fold
Feburary 2016–September 2016	Cell-based	69%	24%
Feburary 2016–September 2016	Egg-based	35%	47%
September 2016–Feburary 2017	Cell-based	52%	45%
September 2016–Feburary 2017	Egg-based	38%	48%