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Table 2 Distribution of bac and bca virulence-associated genes according to serotype and clinical origin of the 434 Streptococcus agalactiae isolates included in the present study

From: Streptococcus agalactiae in Brazil: serotype distribution, virulence determinants and antimicrobial susceptibility

Serotype (number of isolates)

Clinical origin (number of isolates)

Number (%) of bac(+) isolates

Number (%) of bca(+) isolates

Number (%) of bac(+)/bca(+) isolates

Number (%) of bac(-)/bca(-) isolates

Ia (120)

Colonization (55)

1 (1.8%)

31 (56.4%)

6 (10.9%)

17 (30.9%)

Infection (65)

2 (3.1%)

26 (40%)

3 (4.6%)

34 (52.3%)

Ib (81)

Colonization (53)

1 (1.9%)

23 (43.4%)

10 (18.9%)

19 (35.8%)

Infection (28)

0

10 (35.7%)

8 (28.6%)

10 (35.7%)

II (83)

Colonization (52)

2 (3.8%)

26 (50%)

8 (15.4%)

16 (30.8%)

Infection (31)

0

12 (38.7%)

2 (6.5%)

17 (54.8%)

III (29)

Colonization (15)

2 (13.3%)

7 (46.7%)

0

6 (40%)

Infection (14)

0

3 (21.4%)

0

11 (78.6%)

IV (35)

Colonization (18)

0

11 (61.1%)

2 (11.1%)

5 (27.8%)

Infection (17)

0

9 (52.9%)

1 (5.9%)

7 (41.2%)

V (59)

Colonization (42)

1 (2.4%)

18 (42.8%)

2 (4.8%)

21 (50%)

Infection (17)

0

3 (17.6%)

1 (5.9%)

13 (76.5%)

NTa (27)

Colonization (14)

1 (7.1%)

6 (42.9%)

4 (28.6%)

3 (21.4%)

Infection (13)

0

4 (30.8%)

0

9 (69.2%)

Total (434)

Colonization (249)

8 (3.2%)

122 (49%)

32 (12.9%)

87 (34.9%)

Infection (185)

2 (1.1%)

67 (36.2%)

15 (8.1%)

101 (54.6%)

  1. aNT, nontypeable by using antisera against Ia, Ib, II-VIII serotypes.
  2. All the 434 isolates, regardless serotype, were positive for the scpB and lmb virulence-associated genes.