TABLE 2.
Description of E. coli isolates over time and across military treatment facilitiesa
| Isolates by ESBL productionb | Total isolates | Study yr |
Combat zone |
Military treatment facilityc |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Yr 1d | Yr 2e | Iraq | Afghanistan | Unknownf | LRMC | WRAMC | NNMC | BAMC | ||
| Colonizing isolates | 343 | 127 | 216 | 27 | 302 | 14 | 108 | 101 | 66 | 68 |
| ESBL producing | 197 (57.4) | 86 (67.7) | 111 (51.4)g | 14 (51.9) | 176 (58.3) | 7 (50.0) | 63 (58.3) | 54 (53.5) | 40 (60.6) | 40 (58.8) |
| Non-ESBL producing | 146 (42.6) | 41 (32.3) | 105 (48.6) | 13 (48.1) | 126 (41.7) | 7 (50.0) | 45 (41.7) | 47 (46.5) | 26 (39.4) | 28 (41.2) |
| Infecting isolates | 136 | 43 | 93 | 11 | 125 | 0 | 9 | 42 | 66 | 19 |
| ESBL producing | 109 (80.1) | 33 (76.7) | 76 (81.7) | 5 (45.5) | 104 (83.2) | 0 | 7 (77.8) | 35 (83.3) | 53 (80.3) | 14 (73.7) |
| Non-ESBL producing | 27 (19.9) | 10 (23.3) | 17 (18.3) | 6 (54.5) | 21 (16.8) | 0 | 2 (22.2) | 7 (16.7) | 13 (19.7) | 5 (26.3) |
| Total | 479 | 170 | 309 | 38 | 427 | 14 | 117 | 143 | 132 | 87 |
a
All data are presented as no. (%).
b
ESBL, extended-spectrum β-lactamase.
c
LRMC, Landstuhl Regional Medical Center; WRAMC, Walter Reed Army Medical Center; NNMC, National Naval Medical Center; BAMC, Brooke Army Medical Center.
d
Dates of culture: June 2009 to May 2010.
e
Dates of culture: June 2010 to May 2011.
f
Military operation data are missing for six subjects.
g
ESBL production between the study years for the colonizing isolates is significantly different (P = 0.01).