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ORIGINAL ARTICLE
Year : 2020  |  Volume : 13  |  Issue : 4  |  Page : 169-175

Epidemiological, molecular characterization and risk factors of human brucellosis in Iran


1 Department of Microbiology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
2 Department of Biostatistics and Public Health, Faculty of Health, Kashan University of Medical Sciences; Social Determinants of Health (SDH) Research Center, Kashan, Iran
3 Brucellosis Department, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

Correspondence Address:
Rezvan Moniri
Department of Microbiology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan
Iran
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Source of Support: Kashan University of Medical Sciences supported this research (grant No. 95152), Conflict of Interest: None


DOI: 10.4103/1995-7645.280224

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Objective: To determine epidemiological, molecular characterization, and potential risk factors of human brucellosis. Methods: This descriptive study was carried out in the clinical setting in Iran between 2017 and 2018. A total of 297 participants enrolled in the study. The sample size was calculated based on the occurrence rate of brucellosis in different areas. Patients were assessed using serological tests and conventional culture methods. Phage and multiplex PCR methods typed all of Brucella isolates. Potential risk factors of disease were determined. Results: A total of 141 of 297 (47.5%) Brucella strains were isolated and all of them were detected as Brucella melitensis biovar 1. Based on serologic titers, high culture positivity was recorded at 1/640 titer (P<0.006). The risk factors for brucellosis were patients older than 40 years (OR=2.23, 95%CI: 1.4-3.55, P=0.001), animal keeper (OR=7, 95%CI: 1.51-32.41, P=0.005), housewife (OR=8.76, 95%CI: 1.85-41.37, P=0.002), farmer (OR=6.42, 95%CI: 1.21-33.97, P=0.019), and contact with animal (OR=1.31, 95%CI: 0.60-2.85, P=0.005). Conclusions: To the best of our knowledge, this is the first comprehensive report from Iran presenting the detection of Brucella species by the multiplex PCR. Brucella melitensis biovar 1 is still the dominant causative agent in Iran. The consumption of unpasteurized dairy products, living in rural areas, and animal contact were risk factors of brucellosis.


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