TABLE 3.

MICs of β-lactam antibiotics for S. maltophilia KJ and its derived ampD-associated mutants

AntibioticMIC (μg/ml) of antibiotic for strain:
KJKJΔDIKJΔDIIKJΔDIΔDII
Penicillins
    Piperacillin1,0241,0241,0241,024
    Carbenicillin1,0241,0241,0241,024
Cephalosporins
    Cefuroxime2,0482,0482,0482,048
    Cefoxitin1,0241,0241,0241,024
    Ceftriaxone256256256256
    Cefepime64966496
Carbapenems
    Imipenem>32>32>32>32
    Meropenem>32>32>32>32
Monobactam
    Aztreonam>2,048>2,048>2,048>2,048