TABLE 2.

Prevalence of PspA α1α2^a

α1α2 variant	PBCN ID	Protein ID	Total no. of isolates carrying variant (n = 1,352)	% of isolates carrying variant
ND	NA	NA	144	10.7
1	6	10050_2#2_00383	16	1.2
2	9	10050_2#4_00581	35	2.6
3	16	10050_2#8_00268	48	3.6
4	22	10050_2#11_00768	0	0.0
5	23	10050_2#12_01906	25	1.8
6	34	10050_2#20_01349	5	0.4
7	36	10050_2#21_00326	122	9.0
8	39	10050_2#22_01317	11	0.8
9	42	10050_2#24_00225	8	0.6
10	57	10050_2#30_00292	36	2.7
11	64	10050_2#35_00095	31	2.3
12	68	10050_2#37_01815	22	1.6
13	78	10050_2#41_00777	1	0.1
14	79	10050_2#42_00670	115	8.5
15	83	10050_2#45_00391	1	0.1
16	87	10050_2#48_00214	103	7.6
17	89	10050_2#50_00198	47	3.5
18	118	10050_2#71_00865	2	0.1
19	200	9953_7#38_01834	2	0.1
20	215	9953_7#47_00982	82	6.1
21	218	9953_7#49_01131	31	2.3
22	235	9953_7#58_00025	15	1.1
23	264	9953_7#79_01103	0	0.0
24	266	9953_7#81_00909	110	8.1
25	268	9953_7#82_01423	35	2.6
26	306	10071_4#18_00006	3	0.2
27	321	10071_4#30_00648	29	2.1
28	325	10071_4#32_00112	23	1.7
29	333	10071_4#40_00911	2	0.1
30	342	10071_4#46_00491	30	2.2
31	356	10071_4#56_01432	135	10.0
32	372	10071_4#71_00979	18	1.3
33	382	10071_4#80_00989	59	4.4
34	461	10208_2#57_01836	6	0.4
35	477	10396_8#26_00179	0	0.0

^aThe 1,352 isolates are carriage isolates from Massachusetts. ND, not determined (i.e., in these strains, no α1α2 sequence related to the 35 PBCN α1α2 types was found); NA, not applicable.