Table. Phenotypic characterisation of the first Enterobacter hormaechei isolated from dicloxacillin 500 mg capsules, Denmark, February 2023 .

Phenotypic test	Specific characteristics
Identification with Bruker MALDI-TOF MS	Different species within the Enterobacter cloacae complex (E. cloacae, E. kobei, E. hormaechei and E. asburiae) with scores ≥ 2 (E. bugandensis was also suggested for two of the three patient isolates from Odense University Hospital)
Lateral flow assay (NG-test CARBA-5)	NDM-positive and OXA-positive
Antimicrobial susceptibility testing with EUCAST disk diffusion	Resistant: Ampicillin, amoxicillin-clavulanic acid, piperacillin-tazobactam, mecillinam, cefuroxime, ceftriaxone, cefepime and meropenem
	Susceptible: Ciprofloxacin, gentamicin, trimethoprim, sulphonamide and nitrofurantoin

EUCAST: European Committee on Antimicrobial Susceptibility Testing; MALDI-TOF MS: matrix-assisted laser desorption ionization-time of flight mass spectrometry; NDM: New Delhi metallo-β-lactamase; NG: next generation; OXA: oxacillinase.