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Panel:   Enterobacterales Carbapenemase Diversity (CRE)
AR Bank # 0147 Klebsiella oxytoca
Study ID: CRE-36

Biosample Accession #: SAMN04014988


MICs obtained by broth microdilution. Modal MIC is reported.

MICs obtained by broth microdilution. Modal MIC is reported.

MIC results for each antimicrobial agent for an isolate may commonly be ± 1 log2 (doubling dilution) different than what is posted on the FDA & CDC AR Bank website because this is the normal technical variability of antimicrobial susceptibility testing (see J. H. Jorgensen. 1993. J Clin Microbiol. Vol 31[11]: 2841-2844).

Panel:  Enterobacterales Carbapenemase Diversity (CRE)

MIC (μg/ml) Results and Interpretation
Drug MIC (μg/ml) INT
Amikacin <=1S
Ampicillin >32R
Ampicillin/sulbactam 1>32R
Aztreonam 8I
Aztreonam/avibactam <=0.03---
Cefazolin >8R
Cefepime 1S
Cefepime/zidebactam 50.12---
Cefotaxime 1S
Cefotaxime/clavulanic acid 1<=0.25---
Cefoxitin 4S
Ceftazidime 4S
Ceftazidime/avibactam 1<=0.5S
Ceftazidime/clavulanic acid 11---
Ceftolozane/tazobactam 12S
Ceftriaxone 2I
Ciprofloxacin <=0.25S
Colistin 20.5I
Doripenem 2I
Ertapenem 1I
Gentamicin 4I
Imipenem 2I
Imipenem+chelators 32---
Levofloxacin <=0.12S
Meropenem 0.5S
Nitrofurantoin 32S
Piperacillin/tazobactam 116SDD
Tetracycline <=2S
Tigecycline 4<=0.5S
Tobramycin 8R
Trimethoprim/sulfamethoxazole 1>8R
SDD (Susceptible Dose Dependent)
S – I –R Interpretation (INT) derived from CLSI 2023 M100 S33

1 Reflects MIC of first component
2 Clinical and PK/PD data demonstrate colistin has limited clinical efficacy, even if an intermediate result is obtained. Alternative agents are strongly preferred. Colistin should be used in combination with one or more active antimicrobial agents. Consultation with an infectious disease specialist is recommended.
3 Screen for metallo-beta-lactamase production [Rasheed et al. Emerging Infectious Diseases. 2013. 19(6):870-878]
4 Based on FDA break points
5 Cefepime to zidebactam ratio (1:1)
Device manufacturers and users of FDA cleared devices shall consult the FDA’s Antibacterial Susceptibility Test Interpretive Criteria       website for breakpoints recognized or recommended by FDA, and for information regarding FDA exceptions or additions to the applicable, recognized consensus standard.
Molecular Mechanisms of Resistance
Aminoglycoside aadB, aph(3')-Ic
Beta-lactam KPC-3, OXY-1-4
Sulfonamides sul1
Trimethoprim dfrA3b
The resistance mechanisms listed were identified by analysis of whole genome sequence using the ResFinder database (last updated June 2, 2016 and accessed on October 25, 2016). This analysis does not include mutations that may result in antibiotic resistance or resistance determinants added to newer versions of the ResFinder database or other antimicrobial resistance gene databases. Biosample accession numbers have been provided so that users can analyze the data on their own if so desired.
Medium: Trypticase Soy Agar with 5% Sheep Blood (BAP)

Temperature: 35°C
Atmosphere: Aerobic


Remove the sample vial to a container with dry ice or a freezer block. Keep vial on ice or block. (Do not let vial content thaw)

Open vial aseptically to avoid contamination

Using a sterile loop, remove a small amount of frozen isolate from the top of the vial

Aseptically transfer the loop to BAP

Use streak plate method to isolate single colonies

Incubate inverted plate at 35°C ± 2°C for 18-24 hrs.

Storage Temperature & Biosafety

Appropriate safety procedures should always be used with this material. Laboratory safety is discussed in the current publication of 'BioSafety in Microbiological and Biomedical Laboratories' from the U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, and National Institutes of Health.

This product is sent with the condition that you are responsible for its safe storage, handling, and use. All materials are the property of the Centers for Disease Control and Prevention (CDC) and have been made available on behalf of the Food and Drug Administration (FDA). This material is not for use in human subjects and may not be redistributed. While CDC uses reasonable efforts to include accurate and up-to-date information on this product sheet, CDC makes no warranties or representations as to its accuracy. CDC is not liable for damages arising from the misidentification or misrepresentation of cultures. Please refer to the Standard Letter Agreement (SLA) for further details regarding the use of this product.
Isolate History
Date Action Performed
05/23/23MIC was updated with a new value for Aztreonam/avibactam: from '---' to '<=0.03'
05/23/23Drug was added: Aztreonam/avibactam
04/11/23INT was updated with a new value for Tobramycin: from 'I' to 'R'
04/11/23INT was updated with a new value for Gentamicin: from 'S' to 'I'
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