Background: Prevention, control, or eradication of brucellosis in a country or region needs policy-making, decision-making, and possessing accurate epidemiological data and information. Therefore, this study was done to review the epidemiology and some factors affecting the interval between the onset and diagnosis of brucellosis in Markazi Province, Iran. Materials and Methods: In this cross-sectional study, data on patients diagnosed with brucellosis during 2010-2011 in Markazi Province were studied. Data were analyzed by descriptive statistics as well as chi-square test, Fisher's exact test, t-test, and Kolmogorov-Smirnov test using SPSS software. Results: Out of all cases (907), the interval between the onset of symptoms and diagnosis was more than a month in 363 cases (41.7%). The interval between the onset and diagnosis was significantly associated with location (urban or rural) (P=0.001), city of residence (P=0.001), career (P=0.002), and type of disease (new or failure case) (P=0.008). Conclusion: Since the interval time between the onset and diagnosis of brucellosis among rural residents, ranchers, housewives, and farmers is more, greater attention should be paid to this new class.

Keywords: Brucellosis, Epidemiology, Diagnosis

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