Table 6.

Amino acid substitutions of the HA and NA protein in Hulunbuir influenza B strains compared with that in B/Colorado/06/2017, WHO-recommended vaccine strain during 2018–2020

			16	138	142	146	171	183	201	495	544		365	388
	B/Colorado/06/2017	100.00	S	G	G	K	D	V	T	K	T	100.00	Q	A
2019	B/Hulunbuir/1901/2019	98.63	N	D	R	E	del	I	N	R	A	99.57	K	T
2019	B/Hulunbuir/1902/2019	98.63	N	D	R	E	del	I	N	R	A	99.57	K	T
2019	B/Hulunbuir/1903/2019	98.63	N	D	R	E	del	I	N	R	A	99.57	K	T
2019	B/Hulunbuir/1904/2019	98.63	N	D	R	E	del	I	N	R	A	99.57	K	T

Notes: 2009 H1N1 pandemic numbering.