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. 2018 Apr 17;9:715. doi: 10.3389/fmicb.2018.00715

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Copyright © 2018 Mastrorilli, Pietrucci, Barco, Ammendola, Petrin, Longo, Mantovani, Battistoni, Ricci, Desideri and Losasso.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Swimming motility in CuSO₄ supplemented plates of Salmonella strains carrying the copper resistance cluster (blue bars) or not (red bars). Each percentage was calculated taking as 100% of motility the halo diameters in plates without CuSO₄ supplementation. Statistical difference in motility between the two groups of samples was assessed by the Mann-Withney U test. (B) representative picture showing differences in swimming motility between strains carrying (ISZ-17) or lacking (DTU2016-1040) the copper resistance cluster. At high copper concentration (4 mM) motility is inhibited in both strains. The effect of copper on the motility of the biphasic strain ATCC 14018, which lacks the metal resistance gene cluster, in included for comparison.