{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,31]],"date-time":"2026-10-31T02:08:46Z","timestamp":1793412526190,"version":"4.5.0"},"reference-count":61,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,8,22]],"date-time":"2025-08-22T00:00:00Z","timestamp":1755820800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003810","name":"Hospital de Cl\u00ednicas de Porto Alegre","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003810","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell. Infect. Microbiol."],"abstract":"Background<\/jats:title>Critically ill patients, including those with systemic inflammatory response syndrome (SIRS) and sepsis, frequently exhibit gut microbiota disruption due to physiological stress and broad-spectrum antimicrobial therapy (AT). Although antibiotics are essential for controlling infection, they can destabilize the gut microbiota and may contribute to poorer clinical outcomes. The characterization of the gut microbiota of these patients may inform microbiota-based interventions to mitigate antibiotic-induced dysbiosis.<\/jats:p><\/jats:sec>Objective<\/jats:title>This study aimed to identify key bacterial taxa that distinguish sepsis from non-sepsis patients.<\/jats:p><\/jats:sec>Methods<\/jats:title>A total of 89 stool samples (51 non-sepsis, 38 sepsis) were evaluated by amplicon sequencing the 16S rRNA gene to assess microbiota diversity and differential abundance. Samples were stratified by antibiotic exposure time: early AT (within 5th days of initiation) and prolonged AT (6th to 10th days). Additionally, patients were also grouped based on their AT: beta-lactam combined with other antimicrobial classes (BL-combined) and beta-lactam monotherapy (BL).<\/jats:p><\/jats:sec>Results<\/jats:title>During early AT, alpha diversity (Shannon index) was significantly lower in sepsis patients compared to non-sepsis patients (2.48 vs<\/jats:italic>. 3.0, p = 0.01<\/jats:italic>), whereas no significant difference was observed after prolonged treatment (2.65 vs<\/jats:italic>. 2.89, p = 0.58<\/jats:italic>). Beta diversity analysis (Aitchison distance) revealed significant differences between groups early AT (PERMANOVA, p = 0.005<\/jats:italic>), but not in the later phase (p = 0.54<\/jats:italic>), suggesting that microbial communities converge over time. Early AT taxonomic profiling showed a decrease in Anaerobutyricum<\/jats:italic> spp. and an increase in Holdemania<\/jats:italic> spp. in the sepsis group. In the non-sepsis group, Veillonella<\/jats:italic> spp. was impacted by time and beta-lactam combination. Turicibacter<\/jats:italic> spp. showed a reduction in the prolonged AT sepsis group, while Klebsiella<\/jats:italic> spp. was more abundant in the BL-combined sepsis patients.<\/jats:p><\/jats:sec>Conclusions<\/jats:title>Sepsis and non-sepsis patients showed distinct gut microbiota profiles in early AT. In sepsis, the loss of taxa involved in key metabolic functions, as short-chain fatty acid production, reflects dysbiosis and may contribute to worse outcomes. Prolonged antibiotic use may favor enteropathogen overgrowth and gut translocation. These findings highlight the potential of microbiota-based strategies to guide antimicrobial therapy and improve clinical outcomes in critically ill patients.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fcimb.2025.1622866","type":"journal-article","created":{"date-parts":[[2025,8,22]],"date-time":"2025-08-22T05:27:00Z","timestamp":1755840420000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["Microbial diversity and composition in the gut microbiome of patients during systemic inflammatory response syndrome: can we use gut bacteria as potential biomarkers to characterize sepsis?"],"prefix":"10.3389","volume":"15","author":[{"given":"Rafaela","family":"Ramalho Guerra","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia","family":"da Silva Fernandes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ot\u00e1vio","family":"von Ameln Lovison","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanna","family":"de Ross Forni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel","family":"Silva de Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luana Cristina","family":"Viana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dariane","family":"Castro Pereira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Latosinski Matos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miriane","family":"Melo Silveira Moretti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabiana","family":"Zempulski Volpato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luciana","family":"Giordani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia","family":"Orlandi Barth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tarsila","family":"Vieceli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diego","family":"Rodrigues Falci","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M\u00e1rcio","family":"Manozzo Boniatti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Afonso Lu\u00eds","family":"Barth","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreza Francisco","family":"Martins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,8,22]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","DOI":"10.1080\/19490976.2019.1707610\/SUPPL_FILE\/KGMI_A_1707610_SM6815.ZIP","article-title":"Gut microbiota profiles in critically ill patients, potential biomarkers and risk variables for sepsis","volume":"12","author":"Agudelo-Ochoa","year":"2020","journal-title":"Gut Microbes"},{"key":"B2","doi-asserted-by":"publisher","DOI":"10.1038\/s41579-025-01155-0","article-title":"The role of bacterial metabolism in antimicrobial resistance","volume":"23","author":"Ahmad","year":"2025","journal-title":"Nat. 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