{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T02:52:41Z","timestamp":1788922361521,"version":"build-2803163510"},"reference-count":92,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2025,9,5]],"date-time":"2025-09-05T00:00:00Z","timestamp":1757030400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"State assignment of the N.F. Gamaleya National Research Center for Epidemiology and Microbiology","award":["056-00066-23-00"],"award-info":[{"award-number":["056-00066-23-00"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Extraintestinal pathogenic Escherichia coli causes community-acquired and nosocomial pneumonia and poses a risk of infection, especially for patients with impaired lung function, such individuals with cystic fibrosis (CF). When chronic infection develops, eradication of the pathogen is difficult even with aggressive antibacterial therapy and targeted CF treatment. A new agent, Fluorthiazinone (CL-55), an inhibitor of bacterial virulence, was registered in Russia in 2024. The aim of our study was to characterize the genomes of E. coli ST648 isolated from long-term-infected CF patients, describe virulence factors, and investigate the effect of CL-55 on two CF isolates in vitro. Comparison of the genomes of hypermucoviscous isolates showed that, in the presence of a large number of core genes, the isolates have adaptive differences both in their chromosomes and the composition and genes of their plasmidomes. Both isolates formed mature biofilms on an abiotic surface and were able to survive and proliferate inside macrophages. CL-55 in in vitro experiments was effective in suppressing E. coli ST648 in both the aggregate and intracellular states, allowing us to propose the use of Fluorthiazinone as a combinative therapy to facilitate eradication of pathogenic microorganisms in the respiratory tract in patients with CF.<\/jats:p>","DOI":"10.3390\/ijms26178650","type":"journal-article","created":{"date-parts":[[2025,9,5]],"date-time":"2025-09-05T12:18:18Z","timestamp":1757074698000},"page":"8650","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Chronic Escherichia coli ST648 Infections in Patients with Cystic Fibrosis: The In Vitro Effects of an Antivirulence Agent"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7206-3594","authenticated-orcid":false,"given":"Olga L.","family":"Voronina","sequence":"first","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina S.","family":"Kunda","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia N.","family":"Ryzhova","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0437-9404","authenticated-orcid":false,"given":"Ekaterina I.","family":"Ermolova","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizaveta R.","family":"Goncharova","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ekaterina A.","family":"Koroleva","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lidia N.","family":"Kapotina","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elena Yu.","family":"Morgunova","sequence":"additional","affiliation":[{"name":"N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health of Russia, Gamaleya Str., 18, 123098 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5356-9415","authenticated-orcid":false,"given":"Elena L.","family":"Amelina","sequence":"additional","affiliation":[{"name":"Pulmonology Research Institute Under FMBA of Russia, Orekhovy Boulevard, 28, Building 10, 115682 Moscow, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nailya A.","family":"Zigangirova","sequence":"additional","affiliation":[{"name":"N.F. 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