Table 3.

GBS serotype counts in Swedish invasive and commensal isolates

Sero-type	EOD (N = 155)	LOD (N = 51)	Maternal (N = 19)	Stillbirth (N = 4)	Total GBS Invasive Isolates (N = 229)	Swedish GBS Commensal Isolates (N = 356)	p-value, total invasive vs. commensal
Ia	30 (19.4%)	4 (7.8%)	1 (5.3%)	1 (25%)	36 (15.7%)	39 (11%)	0.1
Ib	8 (5.2%)	1 (2.0%)	5 (26.3%)		14 (6.1%)	46 (13%)	0.008
II	8 (5.2%)	1 (2.0%)	1 (5.3%)	1 (25%)	11 (4.8%)	57 (16%)	< 0.001
III	78 (50.3%)	36 (70.6%)	3 (15.8%)		117 (51.1%)	85 (24%)	< 0.001
IV	3 (1.9%)	2 (3.9%)	2 (10.5%)		7 (3.1%)	53 (15%)	< 0.001
V	25 (16.1%)	5 (9.8%)	7 (36.8%)	2 (50%)	39 (17.0%)	68 (19%)	0.58
VII	1 (0.6%)				1 (0.4%)	2 (0.5%)	1
VIII		1 (2.0%)			1 (0.4%)	4 (1%)	0.65
IX	1 (0.6%)	1 (2.0%)			2 (0.9%)	0 (0%)	0.15
NT	1 (0.6%)				1 (0.4%)	2 (0.8%)

This table presents a comparison of serotypes between Swedish GBS invasive and commensal isolates. The percent of serotypes in Swedish commensal GBS isolates (collected in 2005) was previously published and is presented here for comparison with the Swedish invasive GBS isolates [36]. The N in each serotype group of the Swedish commensal GBS isolates was estimated from the reported percent. In addition, serotyping of a subset of the invasive GBS isolates was previously published [8]. Fisher’s exact test was performed to compare the proportion of serotypes within the invasive and commensal GBS isolates of each serotype group (Groups Ia, Ib, II, III, IV and V) with multiple hypothesis correction for 6 tests. Serotype VI was not observed in these isolates

EOD Early-onset disease; LOD Late-onset disease; NR Not reported. NT Non-typeable