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Alliance"],"published-print":{"date-parts":[[2023,2]]},"abstract":"<jats:p>\n                    Neutrophils are vital in defence against pathogens, but excessive neutrophil activity can lead to tissue damage and promote acute respiratory distress syndrome. COVID-19 is associated with systemic expansion of immature neutrophils, but the functional consequences of this shift to immaturity are not understood. We used flow cytometry to investigate activity and phenotypic diversity of circulating neutrophils in acute and convalescent COVID-19 patients. First, we demonstrate hyperactivation of immature CD10\n                    <jats:sup>\u2212<\/jats:sup>\n                    subpopulations in severe disease, with elevated markers of secondary granule release. Partially activated immature neutrophils were detectable 12 wk post-hospitalisation, indicating long term myeloid dysregulation in convalescent COVID-19 patients. Second, we demonstrate that neutrophils from moderately ill patients down-regulate the chemokine receptor CXCR2, whereas neutrophils from severely ill individuals fail to do so, suggesting an altered ability for organ trafficking and a potential mechanism for induction of disease tolerance. CD10\n                    <jats:sup>\u2212<\/jats:sup>\n                    and CXCR2\n                    <jats:sup>hi<\/jats:sup>\n                    neutrophil subpopulations were enriched in severe disease and may represent prognostic biomarkers for the identification of individuals at high risk of progressing to severe COVID-19.\n                  <\/jats:p>","DOI":"10.26508\/lsa.202201658","type":"journal-article","created":{"date-parts":[[2022,12,13]],"date-time":"2022-12-13T12:15:21Z","timestamp":1670933721000},"page":"e202201658","update-policy":"https:\/\/doi.org\/10.26508\/lsa.crossmarkpolicy","source":"Crossref","is-referenced-by-count":29,"title":["Hyperactive immature state and differential CXCR2 expression of neutrophils in severe COVID-19"],"prefix":"10.26508","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8158-4022","authenticated-orcid":true,"given":"Christopher M","family":"Rice","sequence":"first","affiliation":[{"name":"School of Cellular and 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