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Antibiotic exposure and resistance in mixed bacterial populations. (English) Zbl 0626.92002

Antibiotic use is often blamed for increases in the prevalence of infections due to antibiotic-resistant bacteria. This paper clarifies the effects of antibiotic exposure on bacterial antibiotic resistance by developing models that describe the growth of competing bacterial strains whose antibiotic sensitivities differ.
The analysis generalizes logistic growth models to include first-order growth parameters that are arbitrary functions of antibiotic levels. It derives closed-form solutions for population size, composition, and average antibiotic sensitivities as functions of antibiotic exposure. Strategies to minimize the bacterial populations size are analyzed in the context of the model. These heuristic models explore in formal terms the population dynamics thought to underlie resistance development.

MSC:

92C50 Medical applications (general)
92D25 Population dynamics (general)
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