for all isolates tested , imipenem ( n-formimidoyl thienamycin ) , rifampicin , ceftriaxone and cefotaxime had the greatest activity ( mic90 : 0 x 12 , 0 x 25 , 0 x 5 mg/l , respectively ) .
C0007561
ceftriaxone
C0007554
cefotaxime