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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Susceptibility of Haemophilus ducreyi to ampicillin and sulbactam in vitro.

The MICs of ampicillin, ampicillin plus sulbactam in equal proportions, and a range of ampicillin concentrations with a constant 0.5 micrograms/ml concentration of sulbactam were determined for 66 strains of Haemophilus ducreyi by an agar dilution technique with standardized inocula prepared by ultrasonication. Fifty-five strains were susceptible to ampicillin alone (MIC range, 0.06 to 1 microgram/ml). The MICs for the 11 resistant strains were (micrograms per milliliter): range, 8 to greater than 16; MIC for 50% of the strains tested (MIC50), greater than 16; MIC90, greater than 16; 8 of them produced beta-lactamase. In the presence of an equal concentration of sulbactam, the MICs for ampicillin-resistant strains were lowered to (micrograms per milliliter): range, 0.125 to 2; MIC50, 0.25; MIC90, 1. In the presence of a fixed 0.5-micrograms/ml concentration of sulbactam, the MICs for the resistant strains were (micrograms per milliliter): range, 0.125 to 2; MIC50, 0.125; MIC90, 0.25. Sulbactam-ampicillin appears to be suitable for the treatment of H. ducreyi infections, especially those caused by ampicillin-resistant strains.[1]

References

  1. Susceptibility of Haemophilus ducreyi to ampicillin and sulbactam in vitro. Jones, B.M., Hafiz, S., Duerden, B.I. Antimicrob. Agents Chemother. (1986) [Pubmed]
 
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