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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.