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. 1977 May;11(5):844–847. doi: 10.1128/aac.11.5.844

Antimicrobial Susceptibility of Haemophilus parainfluenzae

Joan B Mayo a,a, Laurence R McCarthy a,a,1
PMCID: PMC352084  PMID: 587028

Abstract

Fifty random clinical isolates of Haemophilus parainfluenzae were tested for their susceptibility to 10 antibiotics by a microtiter broth dilution method. Three of the strains tested were resistant to ampicillin, whereas eight were resistant to tetracycline. All strains tested were susceptible to chloramphenicol, kanamycin, gentamicin, cephalothin, and colistin. The ranges of minimal inhibitory concentrations for the three remaining antibiotics were: 0.5 to ≥128 μg of penicillin G per ml, 0.03 to 4 μg of carbenicillin per ml, and 1 to 16 μg of erythromycin per ml. Elevated minimal inhibitory concentrations for penicillin and carbenicillin were noted for the three ampicillin-resistant strains. Tests for beta-lactamase production demonstrated the presence of this enzyme in each of the three ampicillin-resistant strains.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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