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Table 1 Determination of the minimal inhibitory concentration (MIC) and molecular characterization of the 23S rRNA gene mutations of heterogeneous C. jejuni, resistant C. jejuni, resistant C. coli, and C. jejuni ATCC 33560 against AZM

From: Determination of azithromycin heteroresistant Campylobacter jejuni in traveler’s diarrhea

Organism

E-test to AZM

23S rRNA gene mutation at position 2075 (A2075G) for C. jejunib

23S rRNA gene mutation at position 2230 (A2230G) for C. colic

Copy I (FI)

Copy II (FII)

Copy III (FIII)

Copy I (FIa)

Copy II (FIIa)

Copy III (FIIIa)

C. coli c

≥ 256 μg/ml

 

A2230G

A2230G

A2230G

C. coli c

≥ 256 μg/ml

A2230G

A2230G

A2230G

C. coli c

≥ 256 μg/ml

A2230G

A2230G

A2230G

C. coli c

≥ 256 μg/ml

A2230G

A2230G

A2230G

C. jejuni b

≥ 256 μg/ml

A2075G

A2075G

A2075G

 

C. jejuni b

≥ 256 μg/ml

A2075G

A2075G

A2075G

C. jejuni b

≥ 256 μg/ml

A2075G

A2075G

A2075G

C. jejuni b

≥ 256 μg/ml

A2075G

A2075G

A2075G

C. jejuni (outer inhibition zone)a

0.19 μg/ml

No mutation

No mutation

A2075G

C. jejuni (inner inhibition zone)a

≥ 256 μg/ml

A2075G

No mutation

A2075G

ATCC33560

Susceptible

No mutation

No mutation

No mutation

  1. aHeterogeneous C. jejuni
  2. bResistant C. jejuni isolates a base substitution, G for A, were detected at position 2075 (corresponding to position 2059 in the nomenclature for E. coli [Genbank Accession No. J01695])
  3. cResistant C. coli isolates a base substitution, G for A, were detected at position 2230 (corresponding to position 2059 in the nomenclature or E. coli [Genbank Accession No. J01695], C. coli [Genbank Accession No. U09611])