Resumo

PATRICELLI, P et al. Efecto de la persistencia bacteriana sobre la eficacia de la enrofloxacina y ciprofloxacina frente a una cepa de Escherichia coli. FAVE, Secc. Cienc. vet. [online]. 2017, vol.16, n.1, pp.13-29. ISSN 2362-5589.

This work evaluated the effect of persister cells present in a high inocula size of a wild strain of Escherichia coli on the efficacy of enrofloxacin and ciprofloxacin by in vitro time-kill curve assays and mutant prevention concentration testing. In time-kill curves performed with high inocula size, no antibiotics showed bactericidal activity, but only allowed the survival of persister cells. In the assay to determine the mutant prevention concentration, on the surface of agar plates containing high enrofloxacin and ciprofloxacin concentrations, persister cells remained viable and without bacterial colonies development and adopting filamentous morphology as a form of adaptation and survival. The clinical usefulness of mutant prevention concentrations of enrofloxacin and ciproflocxacin against Escherichia coli is discussed, as these high concentrations would allow the survival of a sub-population of persister cells originating a biological reservoir that could give rise to chronic infections and favor the emergence of resistant mutants.

Palavras-chave : Escherichia coli; Persister cells; Mutant prevention concentration.

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