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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

Characteristics

Serotype Ia

(n = 14)

Serotype Ib (n = 12)

Serotype III

(n = 51)

F /χ2 value

P

Age, median (IQR), days

0.38

(0.04,15.25)

7.71

(0.20,23.00)

6.00

(0.17,18.00)

1.590

0.228

 0–6 days, n (%)

10 (71.43)

6 (50.00)

27 (52.94)

1.719

0.423

 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)

0.197

0.906

Preterm (GA < 37 weeks), n (%)

2 (14.29)

2 (16.67)

9 (17.65)

0.092

0.955

Low birth weight (<  2500 g), n (%)

3 (21.43)

2 (16.67)

10 (19.61)

0.097

0.953

Small for gestation age, n (%)

3 (21.43)

0 (0.00)

6 (11.76)

4.049

0.132

  < P10

3 (21.43)

0 (0.00)

3 (5.88)

3.764

0.115*

  < P3

0 (0.00)

0 (0.00)

3 (5.88)

0.695

1.000*

Birth via cesarean section, n (%)

4 (28.57)

5 (41.67)

13 (25.49)

1.180

0.554

Regular antenatal screening, n (%)

12 (85.71)

11 (91.67)

48 (94.12)

1.567

0.565*

Amniotic membrane rupture ≥18 h, n (%)

3 (21.42)

1 (8.33)

9 (17.65)

0.956

0.620

Intrapartum temperature ≥ 37.5 °C, n (%)

4 (28.57)

1 (8.33)

2 (3.92)

6.403

0.041

MSAFa, n (%)

3 (21.43)

4 (33.33)

8 (15.69)

1.803

0.406

Chorioamnionitisb, n (%)

6 (42.86)

1 (8.33)

6 (11.76)

6.969

0.031

Gestational vaginitis, n (%)

4 (28.57)

2 (16.67)

13 (25.49)

0.580

0.748

Gestational bacteriuria, n (%)

1 (7.14)

0 (0.00)

2 (3.92)

1.003

0.715*

GBS disease in infants from previous pregnancies, n (%)

1 (7.14)

0 (0.00)

1 (1.96)

1.787

0.564*

GBS antenatal screening, n (%)

 Done

12 (85.71)

9 (75.00)

41 (80.39)

0.479

0.787

 Not done

2 (14.29)

3 (25.00)

10 (19.61)

  

 Positive

9 (64.29)

6 (50.00)

28 (54.90)

0.589

0.745

 Negative

3 (21.43)

3 (25.00)

13 (25.49)

0.101

0.951

 Standard IAP, n (%)

5 (35.71)

4 (33.33)

20 (39.22)

0.172

0.917

 Postpartum GBS mastitis, n (%)

0 (0.00)

1 (8.33)

2 (3.92)

1.311

0.471

  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
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BMC Pediatrics

ISSN: 1471-2431

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