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Prescription data and clinical laboratory data were analysed to assess the influence of previous antibiotic therapy on the prevalence of beta-lactamase in isolates of Haemophilus influenzae and Moraxella catarrhalis from primary specimens of middle ear fluid from 2129 children aged 0-5 years. The prevalence of beta-lactamase-positive H. influenzae was 6.6% [95% confidence interval (CI): 3.5-9.8%] in children who received antibiotics 5-90 days before isolation of the organism compared with 7.0% (95% CI: 3.9-10.2%) in those who did not. The prevalence of beta-lactamase-positive M. catarrhalis was 90.9% (95% CI: 84.0-97.8%) in children who received antibiotics compared with 86.7% (95% CI: 79.0-94.4%) in those who did not.

Individual use of antibiotics and prevalence of beta-lactamase production among bacterial pathogens from middle ear fluid