DIAGNOSIS, RISK FACTORS, AND MULTIFACTORIAL MODEL FOR PREDICTING SEVERE LEPTOSPIROSIS
DOI:
https://doi.org/10.32782/2226-2008-2026-1-3Keywords:
leptospirosis, diagnosis, prediction, multifactorial modelAbstract
Introduction. Leptospirosis is a common zoonotic infection with high mortality. Despite increasing incidence, diagnosis and severity assessment remain inadequate due to varied clinical signs and limitations of current diagnostic methods. The aim of this study was to stratify the risk coefficient for an unfavorable course of leptospirosis based on a developed mathematical prediction model. Materials and methods. Clinical and laboratory data from 60 leptospirosis patients were analyzed using multifactorial regression to identify independent predictors of severe disease. Results. Significant predictors of severe leptospirosis included: seasonality, initial diagnosis, vomiting, calf pain, serovar type, age, delayed antibiotic therapy, hepatosplenomegaly, neutrophil count, ESR, and urinary changes (diuresis, erythrocytes, protein). The regression model showed high prognostic value for early detection of patients at risk of severe disease. Conclusions. The proposed algorithm and model enable reliable early assessment of severe leptospirosis risk, support timely treatment, and help prevent complications and reduce mortality.
References
Azevedo IR, Amamura TA, Isaac L. Human leptospirosis: In search for a better vaccine. Scand J Immunol. 2023 Nov;98(5):e13316. DOI: 10.1111/sji.13316.
Beauté J, Innocenti F, Aristodimou A, et al. Epidemiology of reported cases of leptospirosis in the EU/EEA, 2010 to 2021. Euro Surveill. 2024 Feb;29(7):2300266. DOI: 10.2807/1560-7917.ES.2024.29.7.2300266.
Ogorodniychuk IV, Soroka NM, Ovcharuk VM, Ovcharuk NP. Epidemiologic features of leptospirosis among the population of Ukraine and in military collectives. UJMM [Internet]. 2023Mar.31 [cited 2025Feb.14];4(1):61–8 (In Ukrainian). Available from: https://ujmm.org.ua/index.php/journal/article/view/329.
Petakh P, Huber W, Kamyshnyi O. Geographical factors and air raid alarms influence leptospirosis epidemiology in Ukraine (2018–2023). One Health. 2024 Jun;19:100944. DOI: 10.1016/j.onehlt.2024.100944.
Costa F, Hagan JE, Calcagno J, et al. Global morbidity and mortality of leptospirosis: a systematic review. PLoS Negl Trop Dis. 2015 Sep 17;9(9):e0003898. DOI: 10.1371/journal.pntd.0003898.
Tsentr hromadskoho zdorovia Ukrainy [Public Health Center of Ukraine]. Elektronnyi resurs: Leptospiroz: shcho potribno znaty. https://phc.org.ua/news/leptospiroz-scho-potribno-znati (accessed 7.10.2024).
Ciurariu E, Prodan-Barbulescu C, Mateescu DM, et al. Diagnostic Advances in Leptospirosis: A Comparative Analysis of Paraclinical Tests with a Focus on PCR. Microorganisms. 2025 Mar 15;13(3):667. DOI: 10.3390/microorganisms13030667.
Ivakhiv O, Vyshnevska N, Iosyk I, et al. A Diagnostically Challenging Leptospirosis Case in a Serviceman in a Combat Zone. Military Medicine. 2025; usaf491. DOI: 10.1093/milmed/usaf491.
Rajapakse S, Fernando N, Dreyfus A, et al. Leptospirosis. Nat Rev Dis Primers. 2025;11:32. https://doi.org/10.1038/s41572-025-00614-5.
Atherstone C, Galloway R, Schafer I, et al. Epidemiological, temporal, and geographic trends of leptospirosis in the United States, 2014–2020. PLOS Neglected Tropical Diseases. 2025; 19(8):e0013427. https://doi.org/10.1371/journal.pntd.0013427.
Grassmann AA, da Cunha CEP, Bettin EB, McBride AJA. Overview of leptospirosis. In: Neglected Tropical Diseases-South Asia; 2017;245–275. DOI: 10.1007/978-3-319-68493-2_8.
Russell CD, Jones ME, O’Shea DT, Simpson KJ, Mitchell A, Laurenson IF. Challenges in the diagnosis of leptospirosis outwith endemic settings: a Scottish single centre experience. J R Coll Physicians Edinb. 2018 Mar;48(1):9–15. DOI: 10.4997/JRCPE.2018.102.
Topol EJ. High-performance medicine: the convergence of human and artificial intelligence. Nat Med. 2019 Jan;25(1):44–56. DOI: 10.1038/s41591-018-0300-7.
Sawesi S, Jadhav A, Rashrash B. Machine Learning and Deep Learning Techniques for Prediction and Diagnosis of Leptospirosis: Systematic Literature Review. JMIR Med Inform. 2025 May 21;13:e67859. DOI: 10.2196/67859.
Chatterjee S, Hadi AS. Regression analysis by example. Edition 5, illustrated, unabridged. John Wiley & Sons; 2013. 424 p.
Piepho HP. A coefficient of determination (R2) for generalized linear mixed models. Biom J. 2019 Jul;61(4):860–872. DOI: 10.1002/bimj.201800270.
Parra Barrera EL, Bello Piruccini S, Rodríguez K, Duarte C, Torres M, Undurraga EA. Demographic and clinical risk factors associated with severity of lab-confirmed human leptospirosis in Colombia, 2015–2020. PLoS Negl Trop Dis. 2023 Jul 26;17(7):e0011454. DOI: 10.1371/journal.pntd.0011454.
CDC. Leptospirosis | Yellow Book. Centers for Disease Control and Prevention. Apr. 23, 2025. Available from: https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/leptospirosis.html.



