Table 2. Sequence identity of 3E1 epitope by subtype.

Residue		Consensus*	CA04/H1 Sequence	Per cent Identity by Subtype
				H1 (5532)†	H5 (217)†	H2 (80)†	H9 (6)†	H13 (93)‡	H16 (38)‡
HA1	18	H	H	99	100	100	0 (Q)§	0 (L)§	0 (L)§
	38	H	H	99	99	100	100	0 (S)§	0 (S)§
	326	T	T	99	100	100	78 (V)§22 (I)	100	100
HA2	16	G	G	99	100	100	100	100	100
	18	V	V	97	100	97	100	98 (I)§	100 (I)§
	19	D	D	99	100	100	0 (A)§	0 (N)§	0(N)§
	20	G	G	100	100	100	100	100	100
	21	W	W	100	100	100	100	100	100
	34	Y	Y	99	100	100	0(M)§	26(I)§	0(I)§
	38	L/K	L	88 (L)§12 (Q)	98(K)§	100(K)§	100(R)§	100(K)§	100(K)§
	42	Q	Q	100	100	100	100	100.0	100
	45	I	I	99	99	0(F)§	78 (I)§22(V)	100	96
	48	I	I	99	0(V)§	100	100	100	100
	49	T	T	99	100	100	100	100	100
	52	V	V	99	100	90	100	0(I)§	0(I)§

^*Most common residue at position by simple majority across all group 1 sequences. HA1 residues are listed first, followed by HA2 residues.

^†Number of sequences available for subtype infecting humans at time of download.

^‡Number of sequences available for subtype at time of download.

^§Most common residue in this subtype.