TABLE 2.

NA amino acid changes from USSR/77 to A/Singapore^a

Amino acid position	16	30	34	45	70	78	83	84	95	149	222	247	254	248	285	339	369	386	434	451	454
Virus strain
USSR/77	A	I	V	H	S	K	M	T	R	V	Q	S	R	D	T	N	K	N	K	S	V
HK/77	-	-	-	-	-	-	-	-	-	I	-	-	-	-	-	-	-	-	-	-	-
Brazil/78	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Lackland/78	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Ostrava/80	-	-	-	-	N	-	V	-	-	-	R	-	-	N	-	T	-	-	-	-	A
Dakar/81	-	-	-	-	N	-	V	-	-	-	R	-	-	N	-	T	-	-	-	-	A
Finland/81	-	-	-	-	N	-	V	-	-	-	R	-	-	N	-	T	-	-	-	-	-
Firenze/83	-	-	-	-	N	-	V	-	-	-	R	-	-	N	-	T	-	-	-	-	-
Chile/83	T	-	-	-	N	-	V	-	-	-	R	-	-	N	-	T	-	-	-	-	A
Victoria/84	T	-	-	-	N	-	V	-	-	-	R	-	-	-	-	T	-	-	R	-	A
Singapore/86	A	V	I	Y	N	Q	V	A	S	-	R	N	K	N	A	T	R	K	N	G	A

^aThe dash sign (-) indicates identical amino acid to A/USSR/90/77.