• Pinar Sen, Tuna Demirdal, and Salih Atakan Nemli.
• Izmzmir Katip Celebi University Ataturk Training and Research Hospital, Department of Infectious Diseases and Clinical Microbiology, Izmir, Turkey.
• Arch Iran Med. 2019 Nov 1; 22 (11): 640-645.

BackgroundIt is important to identify new biomarkers for early detection of complications and treatment success in patients with brucellosis.MethodsA total of 187 brucellosis patients in the Department of Infectious Diseases of Izmir Katip Celebi University Ataturk Training and Research Hospital were evaluated retrospectively from January 2010 to January 2016.Complications of brucellosis were hematologic, osteoarticular, genitourinary, neurologic, cardiovascular, gastrointestinal and ocular involvement. Specific organ involvement was defined as the presence of infection signs in any specific anatomic site except hematologic involvement. Neutrophil-to-lymphocyte ratio (NLR), lymphocyte-to-monocyte ratio (LMR) and platelet-to-lymphocyte-ratio (PLR) were evaluated statistically to predict complications and specific organ involvement of brucellosis.ResultsComplications occurred in 125 patients. We found that PLR and erythrocyte sedimentation rate (ESR) were higher in complicated patients (P = 0.007, P < 0.001). The area under curve (AUC) for PLR was 0.622 (95% confidence interval [CI], 0.538- 0.707) with a cutoff value of >119.6 in predicting complications in brucellosis. LMR and NLR were not significant in terms of predicting complications in brucellosis. We also evaluated only specific organ involvement as a complication due to frequent occurrence of hematologic abnormalities in brucellosis. ESR, mean platelet volume (MPV), NLR, PLR and LMR were significantly different in patients with specific organ involvement (P = 0.001, P = 0.011, P = 0.001, P = 0.013 and P = 0.040). The AUC values for NLR and LMR were 0.649 (95% CI 0.570-0.728) and 0.589 (95% Cl 0.507-0.671), respectively.ConclusionThese biomarkers are cost-effective, simple and broadly available parameters for predicting complications and specific organ involvement of brucellosis.© 2019 The Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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