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