TABLE 3.

Genome divergence analysis of sequential isolates obtained from cats infected with TCA FIV^a

Cat	% Divergence from parental virus at 15 mo p.i.		% Divergence from parental virus or previous isolate per mo
	Total	Per year	0–1	1–3	3–6	6–10	10–15	15–20
275	0.85	0.68	0.54	0.23	0.10	0.06	0.14	NDb
311	0.70	0.56	→			0.21c	0.03	ND
583	0.15	0.12	0.46	0.31	0.18	0.16	0.09	0.03

^aKimura's two-parameter distances as calculated from pairwise comparison of the available sequential isolates. 

^bND, not done; at 20 months, only the virus culture from cat 583 was performed. 

^c% Divergence between parental virus and isolate at 10 mo.