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All group II strains were further classified as subgroup IIb, except for one strain, which harboured a new mutation (N422I). Ampicillin MICs of β-lactamase-negative ampicillin-resistant strains were 6 to 12 times the MICs of susceptible strains. Only bla TEM-1 was detected in β-lactamase-positive clavulanic-acid-resistant strains, and was responsible for high MICs for ampicillin (256 mg/L), whatever the ftsI mutational resistance group. The emergence of cefotaxime-resistant isolates in our country is a matter of concern and requires
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