TABLE 2.

Regions of genetic diversity among clinical isolates

RD	Approximate size (kb)	SP no. of variable genes	Clustera (SP no. of variable genes)
1	9	SP0067-0074	1 (SP0067-0072)
2	5.8	SP0109-0115	1* (SP0109-0113)
3	5.6	SP0163-0168	2 (SP0163-0171)
4	14.2	SP0346-0360	3 (SP0347-0360)
5	3.3	SP0378-0380	Identified but not as cluster
6	5.4	SP0394-0397	4* (SP0388-0399)
7	12.6	SP0460-0468	4 (SP460-470)
8	7.1	SP0473-0478	5* (SP0473-0478)
9	5.6	SP0531-0544	5 (SP0531-0544)
10	11	SP0643-0648	Identified but not as cluster
11	8.0	SP0664-0666	Identified but not as cluster
12	4.4	SP0692-0700	7* (SP691-698)
13	1.7	SP0888-0891	6 (SP887-891)
14	7.9	SP0949-0954	New
15	11.9	SP1050-1065	7 (SP1054-1064)
16	9.2	SP1129-1147	8 (SP1129-1146)
17	33.7	SP1315-1352	9 and 10* (SP1309-1352)
18	12.1	SP1433-1444	11* (SP1433-1437)
19	10.3	SP1612-1622	10 (SP1611-1622)
20	34.8	SP1756-1773	11 (SP1755-1773)
21	5.3	SP1793-1799	12 (SP1791-1794 and 1796-1798)
22	3.2	SP1828-1830	13* (SP2159-2166)
23	3.2	SP1911-1918	New
24	9.4	SP1948-1955	12* (SP1947-1958)
25	5.3	SP2159-2166	13* (SP2159-2166)

^aRelates to work by Bruckner et al. (5). Clusters of strain-specific genes identified by Bruckner et al. but not found in this study are clusters 2*, 3*, 6*, 8*, and 9* (see Table 3 in reference 5).