TABLE 2.

Nucleotide distance and estimated evolution rates of FCV per week for 22 paired virus isolates obtained from 11 cats that appeared to be persistently infected with their own strain of virus during their stay in the shelter

Cat identifier	Time of FCV shedding in the shelter	Time between samples (days)	Nucleotide distancea (%)	Estimated evolution rate per wk (%)
16	Unknown	31	0.2	0.05
13	Acquired	8	0.2	0.2
14	Arrival	67	1.9	0.2
8	Arrival	31	0.9	0.2
5	Arrival	27	0.9	0.2
11	Arrival	21	1.0	0.3
1	Arrival	38	2.1	0.4
20	Arrival	17	1.3	0.5
15	Acquired	23	2.6	0.8
10	Acquired	7	0.8	0.8
7	Arrival (acutely infected)	21	4.2	1.4

^aDetermined by Jukes-Cantor distance analysis.