TABLE 1.

Amino acid changes found in the SUs of the viral samples obtained at 55 months p.i. relative to previous ones

Cat no.	Change at the following amino acid positiona:
	184	195	196	197	249	279	381	392	409	416	417	421	452	469	471	482	485	546	557	558	559	560	562	603
275		S→W	Q→D	G→C	R→K			T→S	E→G	Q→P	C→G					V→I		N→T	S→N			K→E
311						I→V	Q→H					K→T	L→I				A→V		S→N	S→G	I→T		A→T
583	V→I						Q→H						L→I	K→E	P→S		A→V		S→N				A→T	M→L

^aThe changes are in relation to the sequences in samples collected 40 months earlier.