Volume 24, Number 9—September 2018
Research Letter
Spread of mcr-1–Driven Colistin Resistance on Hospital Surfaces, Italy
Elisabetta Caselli
, Maria D’Accolti, Irene Soffritti, Micol Piffanelli, and Sante Mazzacane
, Maria D’Accolti, Irene Soffritti, Micol Piffanelli, and Sante Mazzacane
Table
Antimicrobial susceptibility of the mcr-1–carrying bacterial isolates from hospital surfaces, Italy*
| Bacteria |
No. isolates |
Drug-resistant isolates, % (MIC, mg/L) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| F |
AK |
ATM |
TZP |
C |
SXT |
NET |
CTX |
Col-R |
||
| Acinetobacter Iwoffii | 4 | 50 | 25 | 50 | 50 | 25 | 50 | 25 | 25 | 7 (4–8) |
| Citrobacter freundii | 1 | 0 | 0 | 0 | 0 | 100 | 0 | 0 | 0 | 4 |
| Enterobacter cloacae | 3 | 100 | 100 | 33.3 | 100 | 33.3 | 33.3 | 100 | 33.3 | 16 |
| Enterobacter agglomerans | 3 | 100 | 0 | 0 | 100 | 0 | 0 | 100 | 0 | 5.3 (4–8) |
| Escherichia coli | 4 | 100 | 50 | 25 | 100 | 0 | 25 | 100 | 50 | 10 (8–16) |
| Klebsiella pneumoniae | 6 | 100 | 100 | 33.3 | 66.6 | 66.6 | 0 | 100 | 66.6 | 13.3 (8–16) |
| K. oxytoca | 2 | 100 | 100 | 0 | 0 | 0 | 0 | 100 | 0 | 16 |
| Pseudomonas aeruginosa | 1 | 0 | 100 | 0 | 100 | 100 | 0 | 100 | 100 | 4 |
| P. putida | 1 | 0 | 100 | 0 | 0 | 100 | 0 | 100 | 0 | 8 |
*AK, amikacin 30 μg; ATM, aztreonam 30 μg; C, chloramphenicol 30 μg; Col-R, colistin resistant; CTX, cefotaxime 5 μg; F, nitrofurantoin 100 μg; NET, netilmicin 10 μg; SXT, trimethoprim/sulfamethoxazole 25 μg; TZP, piperacillin/tazobactam 36 μg.
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