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. 1976 Jan;9(1):164–168. doi: 10.1128/aac.9.1.164

Mechanisms of Ampicillin Resistance in Haemophilus influenzae Type B1

R Vega a, H L Sadoff a, M J Patterson a
PMCID: PMC429493  PMID: 1083199

Abstract

The genetic mechanisms associated with ampicillin resistance in strains of Haemophilus influenzae type b were investigated. In experiments concerned with transfer of total deoxyribonucleic acid in vitro, expression of resistance by wild-type strains occurred at a frequency of about 10%. The minimum inhibitory concentration of ampicillin for the transformed strains was similar to that of the resistant donor strains, and resistance in transformants was associated with acquisition of the ability to produce beta-lactamase. Exposure to 39 μg of acridine per ml for 18 h cured resistance at a frequency of 80%, and there was spontaneous loss of resistance after repeated subculture of some strains. Analysis by cesium chloride-ethidium bromide density gradient centrifugation demonstrated the presence of extrachromosomal deoxyribonucleic acid in the resistant strains, providing further evidence that the resistance factor is plasmid mediated.

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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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