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Updated: Aug 17, 2026

Assessing Respiratory Immune Responses to Haemophilus Influenzae
Published on: June 29, 2021
Molecular epidemiology of ampicillin-resistant non-beta-lactamase-producing Haemophilus influenzae
L Gazagne1, C Delmas, E Bingen
1Laboratoire de Microbiologie, Centre Hospitalier Universitaire Purpan, Toulouse, France.
Abstract:
Resistance to ampicillin without beta-lactamase production is not a frequent occurrence among Haemophilus influenzae strains. This kind of resistance is encountered in unencapsulated strains isolated from bronchial secretions and ear, nose, and throat specimens and is exceptional in H. influenzae type b. We studied 29 of these strains from various areas in France and 2 reference strains. Strains were compared by using ribotyping, arbitarily primed PCR with two primers, and pulsed-field gel electrophoresis. Each technique enabled the identification of 20 to 23 different patterns among the 31 strains. The combination of the different patterns for the strains obtained by the different techniques provided 27 distinct profiles. According to these results, it seems that the clonal propagation of these resistant strains does not occur.
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