N. meningitidis
Penicillin and ampicillin are effective therapy for N. meningitidis meningitis, although rare isolates of β-lactamase–producing strains have high-level resistance (MIC, >250 μg per milliliter).65 Clinical isolates with altered penicillin-binding proteins and intermediate resistance to penicillin (MIC, 0.1 to 1.0 μg per milliliter) have been identified in Europe, South Africa, and recently, North Carolina.66-68 The clinical importance of such resistance is unclear, because most patients with meningitis due to these intermediately resistant strains can be treated effectively with penicillin.69,70 At present, penicillin is the drug of choice for N. meningitidis meningitis. For patients who do not have adequate responses, the bacterial isolates should be formally tested and the therapy changed to ceftriaxone (or cefotaxime) if the isolate is resistant to penicillin (MIC, >0.1 μg per milliliter).
N. meningitidis Penicillin and ampicillin are effective therapy for N. meningitidis meningitis, although rare isolates of β-lactamase–producing strains have high-level resistance (MIC, >250 μg per milliliter).65 Clinical isolates with altered penicillin-binding proteins and intermediate resistance to penicillin (MIC, 0.1 to 1.0 μg per milliliter) have been identified in Europe, South Africa, and recently, North Carolina.66-68 The clinical importance of such resistance is unclear, because most patients with meningitis due to these intermediately resistant strains can be treated effectively with penicillin.69,70 At present, penicillin is the drug of choice for N. meningitidis meningitis. For patients who do not have adequate responses, the bacterial isolates should be formally tested and the therapy changed to ceftriaxone (or cefotaxime) if the isolate is resistant to penicillin (MIC, >0.1 μg per milliliter).
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N. meningitidis
Penicillin and ampicillin are effective therapy for N. meningitidis meningitis, although rare isolates of β-lactamase–producing strains have high-level resistance (MIC, >250 μg per milliliter).65 Clinical isolates with altered penicillin-binding proteins and intermediate resistance to penicillin (MIC, 0.1 to 1.0 μg per milliliter) have been identified in Europe, South Africa, and recently, North Carolina.66-68 The clinical importance of such resistance is unclear, because most patients with meningitis due to these intermediately resistant strains can be treated effectively with penicillin.69,70 At present, penicillin is the drug of choice for N. meningitidis meningitis. For patients who do not have adequate responses, the bacterial isolates should be formally tested and the therapy changed to ceftriaxone (or cefotaxime) if the isolate is resistant to penicillin (MIC, >0.1 μg per milliliter).
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