Table 4.
sil PCRs of clinical isolates from different genetic clusters
| Genetic clustera | n | No. (%) positive in PCR |
||||
|---|---|---|---|---|---|---|
| SilC | SilP | SilR | SilS | Allb | ||
| I | 9 | 9 (100) | 6 (67) | 6 (67) | 9 (100) | 6 (67) |
| II | 11 | 11 (100) | 9 (82) | 11 (100) | 10 (91) | 8 (73) |
| III | 33 | 27 (82) | 27 (82) | 27 (82) | 27 (82) | 27 (82) |
| IV | 15 | 15 (100) | 9 (60) | 14 (93) | 15 (100) | 9 (60) |
| V | 18 | 9 (50) | 11 (61) | 5 (28) | 17 (94) | 2 (11) |
| VI + VII | 19 | 17 (89) | 16 (84) | 17 (89) | 16 (84) | 16 (84) |
| VIII | 40 | 32 (80) | 32 (80) | 32 (80) | 32 (80) | 32 (80) |
| IX | 6 | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| XI + XIIc | 7 | 6 (86) | 5 (71) | 6 (86) | 4 (57) | 4 (57) |
| xiii | 6 | 5 (83) | 3 (50) | 3 (50) | 3 (50) | 0 (0) |
| Total | 164 | 131 (80) | 118 (71) | 121 (74) | 133 (81) | 104 (63) |
a
Genetic clusters according to Hoffmann and Roggenkamp (22).
b
Distribution of isolates positive for all PCRs in genetic clusters; chi-square test, P < 0.0001.
c
Includes E. cloacae type strain ATCC 13047.