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Table 2 Demographics and maternal characteristics of infants with serotypes Ia, Ib, and III

From: Etiological serotype and genotype distributions and clinical characteristics of group B streptococcus-inducing invasive disease among infants in South China

CharacteristicsSerotype Ia
(n = 14)
Serotype Ib (n = 12)Serotype III
(n = 51)
F /χ2 valueP
Age, median (IQR), days0.38
(0.04,15.25)
7.71
(0.20,23.00)
6.00
(0.17,18.00)
1.5900.228
 0–6 days, n (%)10 (71.43)6 (50.00)27 (52.94)1.7190.423
 7–89 days, n (%)4 (28.57)6 (50.00)24 (47.06)
Male gender, n (%)8 (57.14)6 (50.00)29 (56.86)0.1970.906
Preterm (GA < 37 weeks), n (%)2 (14.29)2 (16.67)9 (17.65)0.0920.955
Low birth weight (<  2500 g), n (%)3 (21.43)2 (16.67)10 (19.61)0.0970.953
Small for gestation age, n (%)3 (21.43)0 (0.00)6 (11.76)4.0490.132
  < P103 (21.43)0 (0.00)3 (5.88)3.7640.115*
  < P30 (0.00)0 (0.00)3 (5.88)0.6951.000*
Birth via cesarean section, n (%)4 (28.57)5 (41.67)13 (25.49)1.1800.554
Regular antenatal screening, n (%)12 (85.71)11 (91.67)48 (94.12)1.5670.565*
Amniotic membrane rupture ≥18 h, n (%)3 (21.42)1 (8.33)9 (17.65)0.9560.620
Intrapartum temperature ≥ 37.5 °C, n (%)4 (28.57)1 (8.33)2 (3.92)6.4030.041
MSAFa, n (%)3 (21.43)4 (33.33)8 (15.69)1.8030.406
Chorioamnionitisb, n (%)6 (42.86)1 (8.33)6 (11.76)6.9690.031
Gestational vaginitis, n (%)4 (28.57)2 (16.67)13 (25.49)0.5800.748
Gestational bacteriuria, n (%)1 (7.14)0 (0.00)2 (3.92)1.0030.715*
GBS disease in infants from previous pregnancies, n (%)1 (7.14)0 (0.00)1 (1.96)1.7870.564*
GBS antenatal screening, n (%)
 Done12 (85.71)9 (75.00)41 (80.39)0.4790.787
 Not done2 (14.29)3 (25.00)10 (19.61)  
 Positive9 (64.29)6 (50.00)28 (54.90)0.5890.745
 Negative3 (21.43)3 (25.00)13 (25.49)0.1010.951
 Standard IAP, n (%)5 (35.71)4 (33.33)20 (39.22)0.1720.917
 Postpartum GBS mastitis, n (%)0 (0.00)1 (8.33)2 (3.92)1.3110.471
  1. aMeconium-stained amniotic fluid
  2. bChorioamnionitis (CAM): Clinical manifestations include intrapartum fever (temperature ≥ 38 °C) alone or concomitant with maternal leukocytosis, tenderness over the uterus, foul-smelling amniotic fluid, maternal and/or fetal tachycardia, and positive placental pathology
  3. *Fisher’s exact test