Abstract
Emergence of ciprofloxacin stress-induced mutants in the cultures of a collection strain Pseudomonas aeruginosa ATCC 27853 and of two strains with a small colony phenotype, which were isolated from a swimming pool biofilm, was studied. In biofilm cultures of the small colony phenotype strains, which were already resistant to hypochlorite, prolonged incubation (up to 16 days) with sublethal ciprofloxacin concentrations was shown to result in emergence of the cells, which are resistant to the antibiotic and form colonies on media with rifampicin (100 μg/mL) and streptomycin (50 μg/mL). Under the same conditions, the mechanisms of temporary adaptation are switched on in the cells of strain ATCC 27853, which enabled its shortterm survival at an average level in liquid media and provided for colony formation on solid medium with ciprofloxacin (0.2 μg/mL). Only 20% of these colonies remained viable when transferred to a higher antibiotic concentration (2 μg/mL).
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Original Russian Text © N.A. Tsvetkova, N.V. Golyasnaya, L.A. Belyaeva, I.M. Guzacheva, 2016, published in Mikrobiologiya, 2016, Vol. 85, No. 3, pp. 275–282.
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Tsvetkova, N.A., Golyasnaya, N.V., Belyaeva, L.A. et al. Strategies for adaptation to antibiotics in wild type Pseudomonas aeruginosa and in the strains with small colony phenotype. Microbiology 85, 295–301 (2016). https://doi.org/10.1134/S0026261716030140
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DOI: https://doi.org/10.1134/S0026261716030140