EUCAST Expert Rules in Antimicrobial Susceptibility Testing - eibne.gr

Table 6. Exceptional phenotypes of Gram-positive bacteria
Rule
no.
Organisms
Exceptional phenotypes
6.1 Staphylococcus aureus Resistant to vancomycin, teicoplanin, linezolid, quinupristin-dalfopristin, daptomycin,
tigecycline.
6.2 Coagulase-negative staphylococci Resistant to vancomycin, linezolid 1 , quinupristin-dalfopristin 1 , daptomycin, tigecycline.
6.3 JK coryneform organisms Resistant to vancomycin, teicoplanin, linezolid, quinupristin-dalfopristin, daptomycin,
tigecycline.
6.4 Streptococcus pneumoniae Resistant to imipenem, meropenem, vancomycin, teicoplanin, linezolid, quinupristindalfopristin,
daptomycin, tigecycline, rifampicin.
6.5 Group A, B, C and G β-haemolytic streptococci Resistant to penicillin, cephalosporins, vancomycin, teicoplanin, linezolid,
quinupristin-dalfopristin, daptomycin, tigecycline.
6.6 Enterococcus spp. Resistant to linezolid, daptomycin, tigecycline.
Resistant to teicoplanin but not vancomycin.
6.7 Enterococcus faecalis, Enterococcus gallinarum,
Enterococcus casseliflavus, Enterococcus avium
Susceptible to quinupristin-dalfopristin. Consider likelihood of misidentification. If also
resistant to ampicillin it is almost certainly E. faecium.
6.8 Enterococcus faecium Resistant to quinupristin-dalfopristin. Consider likelihood of misidentification,
especially if also susceptible to ampicillin.
1
Except in countries where linezolid or quinupristin-dalfopristin resistant coagulase-negative staphylococci are not rare.