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In humans, the neutrophil to lymphocyte ratio (NLR), platelets to lymphocytes (PLR) and systemic immune-inflammation index (SII) have been described as predictors of morbidity and mortality in various pathologies, but no such studies have been developed for canine leptospirosis. Hence, we aimed to assess the usefulness of NLR, PLR and SII in dogs affected with leptospirosis, focusing on those that died or survived after hospitalization, whether or not they developed LPHS. The leptospirosis group was composed by 36 dogs while the control group consisted of 32 healthy dogs. The NLR, associated with inflammation, demonstrated a threefold or greater increase in all leptospirosis groups compared to the control group (median 2.44\u2009\u00b1\u20091.66) (developing or not LPHS). Dogs that died (median 67.78\u2009\u00b1\u2009158.67), developed LHPS (median 85.17\u2009\u00b1\u2009143.77), or both developed LHPS and died (median 67.78\u2009\u00b1\u2009155,14) had a lower PLR in comparison to the control group (median 101,82\u2009\u00b1\u200953,75) and the rest of groups, but no statistically significant differences were observed (<jats:italic>p<\/jats:italic>\u2009&gt;\u20090.05). The SII was higher in leptospirosis-affected dogs that survived (median 1356,92\u2009\u00b1\u20092726,29) and statistically significant differences were observed in those who did not develop LPHS (median 1770,41\u2009\u00b1\u20092630,77; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) compared to the control group (median 555,21\u2009\u00b1\u2009313,26). Our data shows that NLR may be used as inflammation indicator, while more studies are needed for PLR and SII in canine leptospirosis.<\/jats:p>","DOI":"10.1007\/s11259-024-10469-y","type":"journal-article","created":{"date-parts":[[2024,9,10]],"date-time":"2024-09-10T06:02:32Z","timestamp":1725948152000},"page":"4105-4111","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Determination of neutrophil-to-lymphocyte ratio, platelet-to-lymphocyte ratio and systemic immune-inflammation index in dogs with leptospirosis"],"prefix":"10.1007","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2952-0184","authenticated-orcid":false,"given":"A.","family":"Dur\u00e1n-Galea","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9015-7690","authenticated-orcid":false,"given":"J. 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