{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T18:16:49Z","timestamp":1773339409036,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T00:00:00Z","timestamp":1769040000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Microorganisms"],"abstract":"<jats:p>Klebsiella pneumoniae is commonly known to cause a vast range of community-acquired or nosocomial infections. The isolation of K. pneumoniae has also been noted in diseased food-producing animals, including swine. The main goals of this study were to document clinical manifestation of a septicaemia outbreak in suckling piglets due to K. pneumoniae ST25 and provide molecular characterisation of the isolates. For the purpose of this investigation, 13 dead suckling piglets with cyanosis were selected. All the isolates obtained from affected lungs were susceptible to apramycin, ceftiofur, gentamycin, neomycin, and spectinomycin, presented intermediate susceptibility to florfenicol, and were resistant to other tested antibiotics. Histopathological examination of lungs, kidneys, and livers revealed lesions typical of septicaemia. MLST analysis of the isolates demonstrated a complex metabolic profile of the bacteria with genes attributable to the hypervirulent phenotype. To the best of our knowledge, we documented the first outbreak of K. pneumoniae septicaemia in suckling piglets reared in Poland.<\/jats:p>","DOI":"10.3390\/microorganisms14010256","type":"journal-article","created":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T13:55:34Z","timestamp":1769176534000},"page":"256","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["First Isolation of Klebsiella pneumoniae from Septicaemic Piglets in Poland"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9720-4840","authenticated-orcid":false,"given":"Piotr","family":"Cybulski","sequence":"first","affiliation":[{"name":"Goodvalley Agro S.A., Dworcowa 25, 77-320 Przechlewo, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7120-6632","authenticated-orcid":false,"given":"Ines","family":"Spiekermeier","sequence":"additional","affiliation":[{"name":"SAN Group Biotech Germany GmbH, M\u00fchlenstrasse 13, 49685 H\u00f6ltinghausen, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5847-0748","authenticated-orcid":false,"given":"Rados\u0142aw","family":"Kondratiuk","sequence":"additional","affiliation":[{"name":"Goodvalley Agro S.A., Dworcowa 25, 77-320 Przechlewo, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3796-4132","authenticated-orcid":false,"given":"Artur","family":"Jab\u0142o\u0144ski","sequence":"additional","affiliation":[{"name":"Department of Pathology and Veterinary Diagnostics, Institute of Veterinary Medicine, Warsaw University of Life Sciences\u2013SGGW, Nowoursynowska 159C, 02-776 Warsaw, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1421-4563","authenticated-orcid":false,"given":"Patryk","family":"Tarka","sequence":"additional","affiliation":[{"name":"Department of Social Medicine and Public Health, Medical University of Warsaw, Pawi\u0144skiego 3a, 02-106 Warsaw, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1333-4275","authenticated-orcid":false,"given":"Grzegorz","family":"Wo\u017aniakowski","sequence":"additional","affiliation":[{"name":"Department of Infectious, Invasive Diseases and Veterinary Administration, Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Torun, Lwowska 1, 87-100 Toru\u0144, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e00355-19","DOI":"10.1128\/AAC.00355-19","article-title":"The Microbiology of Bloodstream Infection: 20-Year Trends from the SENTRY Antimicrobial Surveillance Program","volume":"63","author":"Diekema","year":"2019","journal-title":"Antimicrob. 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