TABLE 1.
Identification scoresa
| S. agalactiae strain(s) (n) | No. (%) of strains with log(score)
|
|||
|---|---|---|---|---|
| Initial reference library
|
New reference library
|
|||
| ≥2.3 | <2.3 and ≥2.0 | ≥2.3 | <2.3 and ≥2.0 | |
| All (110) | 86 (78) | 24 (22) | 109 (99) | 1 (1) |
| Serotype Ia (15) | 11 (73) | 4 (27) | 15 (100) | 0 |
| Serotype Ib (7) | 7 (100) | 0 | 7 (100) | 0 |
| Serotype II (17) | 15 (88) | 2 (12) | 17 (100) | 0 |
| Serotype III (45) | 29 (64) | 16 (36) | 44 (98) | 1 (2) |
| Serotype IV (7) | 7 (100) | 0 | 7 (100) | 0 |
| Serotype V (16) | 15 (94) | 1 (6) | 16 (100) | 0 |
| ST1 (16) | 13 (81) | 3 (19) | 16 (100) | 0 |
| ST10 (8) | 7 (88) | 1 (12) | 8 (100) | 0 |
| ST17 (15) | 12 (80) | 3 (20) | 15 (100) | 0 |
| ST19 (13) | 10 (77) | 3 (23) | 13 (100) | 0 |
| ST23 (7) | 3 (43) | 4 (57) | 7 (100) | 0 |
a
Scores were produced by the pattern-matching algorithm with the initial MALDI Biotyper reference library (main spectra of S. agalactiae ATCC 27956 THL and S. agalactiae DSM 2134) and with a new reference library (mass spectra of five S. agalactiae strains selected to represent each major intraspecies lineage [ST1, ST10, ST17, ST19, and ST23]) for 110 S. agalactiae strains, according to serotypes and major intraspecies STs.