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Table 1 List of acquired β-lactamases resistance genes identified in A. baumannii isolates (n = 85) from humans and dried milk based on WGS data using ResFinder database

From: WGS based analysis of acquired antimicrobial resistance in human and non-human Acinetobacter baumannii isolates from a German perspective

Mechanism

AMR genes

Group

No. (%)

Source

Resistance pattern

Amber class A β-lactamases

blaTEM.1D_1

TEM

3 (3.5%)

Human

PIP-PIT/CTX-CAZ-CAA-CTA-CEP /IMP-MER-ERT

blaCARB.5_1

CARB-5

3 (3.5%)

Human

Amber class C β-lactamases

blaADC.25_1

ADC

14 (16.5%)

Human

11 [PIP-PIT/CTX-CAZ-CTA-CEP/IMP-MER-ERT]

71 (83.5%)

Milk powder

66 [CTX], 10 [ERT]

Amber class D β-lactamases

blaOXA.23_1

OXA-23

12 (14%)

Human

12 [PIP-PIT/CTX-CAZ-CTA-CE/IMP-MER-ERT], 10 [CAA]

blaOXA.120_1

OXA-51

2 (2.3%)

Milk powder

CTX

blaOXA.203_1

1 (1.2%)

Milk powder

CTX

blaOXA.259_1

1 (1.2%)

Milk powder

CTX-ERT

blaOXA.343_1

4 (4.7%)

Milk powder

–

blaOXA.346_1

4 (4.7%)

Milk powder

4 [CTX], 2 [ERT]

blaOXA.380_1

2 (2.3%)

Milk powder

CTX

blaOXA.386_1

1 (1.2%)

Milk powder

CTX

blaOXA.424_1

1 (1.2%)

Milk powder

CTX-ERT

blaOXA.430_1

24 (28.2%)

Milk powder

24 [CTX], 4 [ERT]

blaOXA.431_1

1 (1.2%)

Milk powder

CTX

blaOXA.51_1

1 (1.2%)

Milk powder

CTX

blaOXA.64_1

9 (10.5%)

Milk powder

8[CTX]/1 [COL]

blaOXA.66_1

10 (11.8%)

Human

10 [PIP-PIT/CTX-CAZ-CTA/IMP-MER-ERT], 9 [CEP], 7 [CAA].

blaOXA.69_1

1 (1.2%)

Human

PIP-PIT/CTX-CAZ-CAA-CTA-CEP /IMP-MER-ERT

blaOXA.72_1

1 (1.2%)

Human

PIP-PIT/CTX-CAZ-CTA/IMP-MER-ERT

blaOXA.91_1

2 (2.2%)

Human

PIP-PIT/CTX-CAZ-CAA-CTA-CEP /IMP-MER-ERT

19 (22.3%)

Milk powder

CTX

blaOXA.510_1

single

variant

1 (1.2%)

Milk powder

CTX

blaOXA.521_1

single

variant

1 (1.2%)

Human

PIP-PIT/CTX-CAZ-CAA-CTA-CEP/IMP-MER-ERT

  1. AMR antimicrobial resistance gene, PIP piperacillin, PIT piperacillin/tazobactam, CTX cefotaxime, CAZ ceftazidime, CAA ceftazidime/avibactam, CEP cefepime; CTA ceftolozane/tazobactam, IMP imipenem, MER meropenem, ERT ertapenem