TABLE 4.

Confidence intervals^a

Patient	MRCA to base plasma virus (%) (CI)	MRCA to year 2 viral isolate (%) (CI)
A	0.585 (0, 1.404)	0.293 (0, 0.872)
B	0.0 (0, 0.558)	0.0 (0, 0.558)
C	0 (0, 0.722)	0.583 (0, 1.399)
K	1.466 (0.154, 2.81)	1.78 (0.342, 3.257)
L	0.864 (0, 1.853)	0.0 (0, 0.590)
M	0.570 (0, 1.392)	2.727 (0.953, 4.561)

^aBranch lengths with confidence intervals (CI) of segments joining the root of the plasma viral sequence(s) nearest the year 2 viral clusters with the MRCA (identified based on the nearest plasma clone[s] and all year 2 viral isolate sequences) (column 2) and joining the root of year 2 viral isolate clusters and the same MRCA (column 3). The data were generated with fastDNAML (7, 30) and correspond to the phylogenetic tree shown in Fig. 2.