{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T06:37:20Z","timestamp":1767681440519,"version":"3.48.0"},"reference-count":84,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T00:00:00Z","timestamp":1767657600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Bioinform."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Rapid detection of bacterial infections through leukocyte activation analysis could significantly reduce diagnostic timeframes from days to hours. Traditional methods like flow cytometry and biomarker assays face limitations including technical complexity, equipment requirements, and delayed results.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We developed a dual artificial neural network system combining stain-free light microscopy with microfluidic technology to detect morphological changes in activated leukocytes. YOLOv4 networks were trained using five-fold cross-validation on images of chemically stimulated leukocyte subpopulations (lymphocytes, monocytes, and neutrophils) and validated against flow cytometry. The system was tested on whole blood samples spiked with\n                      <jats:italic>E. coli<\/jats:italic>\n                      at clinically relevant concentrations (10\u2013250 CFU\/mL).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The optimized four-class network achieved high performance metrics for lymphocytes (F1 score: 80.1% \u00b1 2.5%) and neutrophils (F1 score: 91.7% \u00b1 1.7%), while a specialized binary classifier for monocytes achieved 97.0% \u00b1 2.8% F1 score. In bacteria-spiked whole blood experiments, the system successfully detected activated leukocytes within 30 min at concentrations approaching clinical blood culture detection limits (11.11 \u00b1 4.79 CFU\/mL). Neutrophils showed rapid activation peaking at 1\u20133 h, while lymphocyte activation increased gradually over 6\u201312 h, consistent with innate versus adaptive immune response kinetics.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This AI-assisted microscopy platform enables rapid, label-free detection of leukocyte activation in response to bacterial infection with minimal sample handling and no requirement for specialized staining or trained technicians. The technology demonstrates potential for accelerating infection diagnosis and could be extended to other pathologies with morphological manifestations.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fbinf.2025.1725145","type":"journal-article","created":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T06:33:47Z","timestamp":1767681227000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Stain-free artificial intelligence-assisted light microscopy for the identification of leukocyte morphology change in presence of bacteria"],"prefix":"10.3389","volume":"5","author":[{"given":"Alexander","family":"Hunt","sequence":"first","affiliation":[]},{"given":"Holger","family":"Schulze","sequence":"additional","affiliation":[]},{"given":"Kay","family":"Samuel","sequence":"additional","affiliation":[]},{"given":"Robert B.","family":"Fisher","sequence":"additional","affiliation":[]},{"given":"Till T.","family":"Bachmann","sequence":"additional","affiliation":[]}],"member":"1965","published-online":{"date-parts":[[2026,1,6]]},"reference":[{"key":"B1","unstructured":"Anemia, anemia\n          \n          \n          2024"},{"key":"B2","doi-asserted-by":"publisher","first-page":"313","DOI":"10.1007\/s11626-013-9705-2","article-title":"Concanavalin A-mediated T cell proliferation is regulated by herpes virus entry mediator costimulatory molecule","volume":"50","author":"Ando","year":"2014","journal-title":"Vitro Cell. & Dev. 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