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Potential significance of colonization with beta-lactamase-producingHaemophilus parainfluenzae in children

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Abstract

Recent surveys in Vancouver showed most healthy children were colonized withβ-lactamaseproducingHaemophilus parainfluenzae. Such organisms might alter the effects of penicillins on throat bacteria by local inactivation. To test this hypothesis in vitro, three isolates ofβ-lactamaseproducingHaemophilus parainfluenzae were each mixed on a membrane with ampicillin-sensitive strains ofHaemophilus influenzae type b or group AStreptococcus pyogenes and exposed to ampicillin. When tested alone, susceptible strains were rapidly killed but when tested together with aβ-lactamase producer, they were protected, indicating efficient ampicillin degradation byHaemophilus parainfluenzae strains. If similar interactions occur in vivo, the effects ofβ-lactams on throat bacteria could be significantly altered in the presence ofβ-lactamase-producingHaemophilus parainfluenzae.

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Scheifele, D.W., Fussell, S.J. Potential significance of colonization with beta-lactamase-producingHaemophilus parainfluenzae in children. Eur. J. Clin. Microbiol. 2, 196–199 (1983). https://doi.org/10.1007/BF02029515

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