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European Committee on Antimicrobial Susceptibility Testing

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Moraxella catarrhalis EUCAST Clinical Breakpoint Tables v. 7.0, valid from 2017-01-01<br />

Fluoroquinol<strong>on</strong>es<br />

MIC breakpoint<br />

(mg/L)<br />

Disk<br />

c<strong>on</strong>tent<br />

Z<strong>on</strong>e diameter<br />

breakpoint<br />

(µg) (mm)<br />

S ≤ R > S ≥ R <<br />

Ciprofloxacin 0.5 0.5 5 26 A 26 A<br />

Levofloxacin 1 1 5 26 A 26 A<br />

Moxifloxacin 0.5 0.5 5 23 A 23 A<br />

Nalidixic acid (screen) NA NA 30 23 B Note B<br />

Norfloxacin (uncomplicated UTI <strong>on</strong>ly) - - - -<br />

Ofloxacin 0.5 0.5 5 25 A 25 A<br />

Notes<br />

Numbered notes relate to general comments and/or MIC breakpoints.<br />

Lettered notes relate to the disk diffusi<strong>on</strong> method.<br />

A. The nalidixic acid disk diffusi<strong>on</strong> test can be used to screen for fluoroquinol<strong>on</strong>e resistance. See Note B.<br />

B. Isolates categorised as susceptible to nalidixic acid can be reported susceptible to ciprofloxacin, levofloxacin, moxifloxacin and<br />

ofloxacin. Isolates categorised as n<strong>on</strong>-susceptible may have fluoroquinol<strong>on</strong>e resistance and should be tested against the<br />

appropriate agent.<br />

Aminoglycosides<br />

MIC breakpoint<br />

(mg/L)<br />

Disk<br />

c<strong>on</strong>tent<br />

Z<strong>on</strong>e diameter<br />

breakpoint<br />

(µg) (mm)<br />

S ≤ R > S ≥ R <<br />

Amikacin IE IE IE IE<br />

Gentamicin IE IE IE IE<br />

Netilmicin IE IE IE IE<br />

Tobramycin IE IE IE IE<br />

Notes<br />

Numbered notes relate to general comments and/or MIC breakpoints.<br />

Lettered notes relate to the disk diffusi<strong>on</strong> method.<br />

Glycopeptides and lipoglycopeptides<br />

MIC breakpoint<br />

(mg/L)<br />

Disk<br />

c<strong>on</strong>tent<br />

Z<strong>on</strong>e diameter<br />

breakpoint<br />

(µg) (mm)<br />

S ≤ R > S ≥ R <<br />

Dalbavancin - - - -<br />

Oritavancin - - - -<br />

Teicoplanin - - - -<br />

Telavancin - - - -<br />

Vancomycin - - - -<br />

Notes<br />

Numbered notes relate to general comments and/or MIC breakpoints.<br />

Lettered notes relate to the disk diffusi<strong>on</strong> method.<br />

Macrolides, lincosamides and streptogramins<br />

MIC breakpoint<br />

(mg/L)<br />

Disk<br />

c<strong>on</strong>tent<br />

Z<strong>on</strong>e diameter<br />

breakpoint<br />

(µg) (mm)<br />

S ≤ R > S ≥ R <<br />

Azithromycin 0.25 1 0.5 1 Note A Note A<br />

Clarithromycin 0.25 1 0.5 1 Note A Note A<br />

Erythromycin 0.25 0.5 15 23 A 20 A<br />

Roxithromycin 0.5 1 1 1 Note A Note A<br />

Telithromycin 0.25 0.5 15 23 20<br />

Notes<br />

Numbered notes relate to general comments and/or MIC breakpoints.<br />

Lettered notes relate to the disk diffusi<strong>on</strong> method.<br />

1/A. Erythromycin can be used to determine susceptibility to azithromycin, clarithromycin and roxithromycin.<br />

Clindamycin - - - -<br />

Quinupristin-dalfopristin - - - -<br />

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