TABLE 3.

Amino acid variations in the HA1 region of influenza B viruses^a,b

Group, lineage, and strain or isolate	Amino acid at indicated position
Group 1 (n = 4),c B/Yamagata/16/ 88 lineage	29	40	48	56	75	88	116	126	131	162	168	172	179	180	183	184	197
Reference strain: B/Victoria/504/00	A	H	K	T	I	K	K	N	P	R	T	P	H	I	K	E	D
SA10	V	Y	R	D	T	R	N	D	-	K	N	S	Y	V	E	G	N
SA40	V	-	R	D	T	R	N	D	L	K	N	-	Y	-	E	G	N
SA43	V	-	R	D	T	R	N	D	L	K	N	-	Y	-	E	G	N
SA96	V	-	R	D	T	R	N	D	L	K	N	-	Y	-	E	G	N
B/Hong Kong/330/01	V	-	-	K	-	R	R	-	-	K	-	S	Y	-	E	G	S
Group 2 (n = 28), B/Victoria/2/87 lineage	34	197
Reference strain: B/Hong Kong/330/01	T	S
SA115	M	N
27 others	-	N
Group 3 (n = 73), B/Victoria/2/87 lineage	15	37	56	90	118	121	144	154	165	190	197	199
Reference strain: B/Hong Kong/1351/02	V	T	K	V	R	T	P	A	N	V	K	T
SA11	M	-	-	-	-	-	-	-	-	-	N	-
SA30, SA31, SA88, SA94	-	I	-	-	-	-	-	-	-	-	N	-
SA9, SA19	-	-	E	-	-	-	-	-	-	-	N	-
SA15	-	-	E	I	-	-	-	-	-	-	N	A
SA21, SA28, SA90, SA91	-	-	-	-	-	-	L	-	-	-	N	-
SA27	-	-	-	-	-	-	-	S	-	-	N	-
SA92	-	-	-	-	K	-	-	-	-	-	N	-
SA84	-	-	-	-	-	A	-	-	-	-	N	-
SA53	-	-	-	-	-	-	-	-	K	G	N	-
SA62, SA63	-	-	-	-	-	-	-	-	Y	-	N	-
55 others	-	-	-	-	-	-	-	-	-	-	N	-

^aAmino acid residues of reference sequences are shown in boldface. Positions are listed for each group.

^b-, amino acid residues identical with the sequences of respective reference strain.

^cItalicized residues are identical to those of B/Hong Kong/330/01.