Table 2. Microbiological and molecular characteristics of rectal swab samples collected from travelers from the Netherlands immediately pre- and post–travel and 6 mo after return*.
| ID | Immediate post-travel samples |
Post-travel sample 6 mo after return, isolate 3† |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pretravel sample |
Isolate 1 |
Isolate 2 |
|||||||||||||
| Species | CTX-M group | ST | Species | CTX-M group | ST | Species | CTX-M group | ST | Species | CTX-M group | ST | ||||
| 25 | Neg | NA | NA | E. coli | 9 | 131 | None | NA | NA | E. coli | 9 | 131 | |||
| 45 | Neg | NA | NA | E. coli | 1 | 405 | E. coli | 9 | 38 | E. coli | 1 | 405 | |||
| 56 | Neg | NA | NA | E. coli | 1 | 3036 | E. coli | 1 | 517 | E. coli | 1 | 3267 | |||
| 60 | Neg | NA | NA | E. coli | 1 | 648 | K.p. | 1 | ND | E. coli | 1 | 648 | |||
| 61 | Neg | NA | NA | E. coli | 1 | 648 | E. coli | 9 | 227 | E. coli | 1 | 131 | |||
| 62 | Neg | NA | NA | E. coli | 9 | 3037 | None | NA | NA | E. coli | 9 | 501 | |||
| 80 | Neg | NA | NA | E. coli | 1 | 131 | None | NA | NA | E. coli | 9 | 1177 | |||
| 86 | Neg | NA | NA | E. coli | 1 | 93 | E. coli | 1 | 2090 | E. cloacae | 9 | ND | |||
| 137 | Neg | NA | NA | E. coli | 1 | 155 | E. coli | 1 | 617 | E. coli | 9 | 131 | |||
| 204 | Neg | NA | NA | E. coli | 1 | 38 | None | NA | NA | K.p. | 1 | ND | |||
| 211 | Neg | NA | NA | E. coli | 1 | 3044 | None | NA | NA | K.p. | 1 | ND | |||
| 222 | Neg | NA | NA | E. coli | 9 | 2003 | None | NA | NA | E. coli | 9 | 2003 | |||
| 238 | Neg | NA | NA | E. coli | 9 | 414 | None | NA | NA | E. coli | 9 | 10 | |||
| 251 | Neg | NA | NA | E. coli | 1 | 34 | None | NA | NA | E. coli | 1 | 450 | |||
| 309 | Neg | NA | NA | E. coli | 1 | 3045 | None | NA | NA | E. coli | 1 | 3045 | |||
| 373 | Neg | NA | NA | E. coli | 1 | 38 | None | NA | NA | E. coli | 1 | 3266 | |||
| 387 | Neg | NA | NA | E. coli | 1 | 131 | None | NA | NA | E. coli | 1 | 131 | |||
| 454 | Neg | NA | NA | E. coli | 9 | 10 | None | NA | NA | E. coli | 9 | 10 | |||
| 474 | Neg | NA | NA | E. coli | 1 | 154 | None | NA | NA | E. coli | 1 | 131 | |||
| 12 | E. coli | 9 | 38 | E. coli | 1 | 3074 | None | NA | NA | E. coli | 1 | 38 | |||
| 105 | E. coli | 1 | 191 | E. coli | 1 | 120 | E. coli | 1 | 38 | E. coli | 1 | 120 | |||
| 255 | E. coli | 9 | 131 | E. coli | 1 | 617 | None | NA | NA | E. coli | 9 | 131 | |||
| 269 | K.p. | 1 | ND | K.p. | 1 | ND | None | NA | NA | K.p. | 1 | ND | |||
| 283 | E. coli | 9 | 131 | E. coli | 1 | 46 | None | NA | NA | E. coli | 9 | 131 | |||
| 505 | E. coli | 1 | 1163 | E. coli | 1 | 69 | None | NA | NA | E. coli | 9 | 3268 | |||
| 512 | E. coli | 9 | 657 | E. coli | 9 | 657 | None | NA | NA | E. coli | 1 | 657 | |||
*ID, participant identification number; CTX-M, extended-spectrum β-lactamase enzyme; ST, sequence type; Neg, no species were isolated from sample; E., Escherichia; K.p., Klebsiella pneumoniae; NA, not applicable; ND, no sequence type data available. †None of the participants with a positive rectal swab sample after 6 months reported antimicrobial drug use during the 6 months after return.