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Bacterial isolates that express high levels of RpoS display high resistance to environmental stresses, such as temperature, pH and osmolarity shifts, but are less nutritional competent, making them less capable of utilising alternative nutrient sources. The role of RpoS in antibiotic resistance and persistence in standard laboratory domesticated strains has been examined in several studies, most demonstrating a positive role for RpoS.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Using disk diffusion assays we examined bacterial resistance to 15 different antibiotics, including\n                      <jats:inline-formula>\n                        <jats:alternatives>\n                          <jats:tex-math>$$\\upbeta$$<\/jats:tex-math>\n                          <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                            <mml:mi>\u03b2<\/mml:mi>\n                          <\/mml:math>\n                        <\/jats:alternatives>\n                      <\/jats:inline-formula>\n                      -lactams (penicillins, monobactams, carbapenems and cephalosporins), aminoglycosides, quinolones and anti-folates, in a representative collection of 328\n                      <jats:italic>E. coli<\/jats:italic>\n                      natural isolates displaying a continuum of different levels of RpoS. There was an overall trend that isolates with higher levels of RpoS were slightly more resistant to these antibiotics. In addition, the effect of RpoS on bacterial tolerance and persistence to 3 different antibiotics - ampicillin, ciprofloxacin and kanamycin was evaluated through time-kill curves. Again, there was a small beneficial effect of RpoS on tolerance and persistence to these antibiotics, but this difference was not statistically significant. Finally, a K-12 strain expressing high levels of RpoS was compared with its isogenic RpoS-null counterpart, and no significant effect of RpoS was found.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>\n                      Based on a representative collection of the species\n                      <jats:italic>E. coli<\/jats:italic>\n                      , RpoS was found to have a very small impact on antibiotic resistance, tolerance, or persistence.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12866-024-03222-7","type":"journal-article","created":{"date-parts":[[2024,3,5]],"date-time":"2024-03-05T08:03:27Z","timestamp":1709625807000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["RpoS role in antibiotic resistance, tolerance and persistence in E. coli natural isolates"],"prefix":"10.1186","volume":"24","author":[{"given":"Estela Yn\u00e9s","family":"Valencia","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe","family":"de Moraes Gomes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katia","family":"Ospino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beny","family":"Spira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,3,5]]},"reference":[{"key":"3222_CR1","doi-asserted-by":"publisher","unstructured":"Abram F, Arcari T, Guerreiro D, O\u2019Byrne CP. 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