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Background Understanding the clinical characteristics and risk factors of active tuberculosis (ATB) in Behçet’s disease (BD) is of great significance to improve the treatment efficacy and guide the preventive treatment. However, the relevant studies are very limited. Methods We retrospectively reviewed medical records of BD patients admitted to our institute from 2010 to 2019. BD patients with ATB were enrolled as the case group, and the control group was selected by random number sampling from the remaining BD patients. Multivariate logistic regression analysis was performed to explore the potential risk factors of ATB in BD patients. Figure 1. Flowchart of the study Results Twenty-one ATB cases were identified from 386 BD patients, including four (19.0%) microbiologically confirmed and 17 (81.0%) clinically diagnosed. ATB patients can present with systemic symptoms (fever, night sweating, unexplained weight loss) and/or symptoms related to the infection site. Logistic regression analysis revealed that ESR&amp;gt;60mm/h (OR=13.710, 95%CI (1.101, 170.702)), increased IgG (OR=1.226, 95%CI (1.001, 1.502)), and positive T-SPOT.TB (OR=7.793, 95%CI (1.312, 48.464), for 24-200 SFC/106PBMC; OR=17.705 (2.503, 125.260), for &amp;gt;200 SFC/106PBMC) were potential risk factors for ATB in BD patients. Table 1. Past medical history and medication of BD patients with and without ATB Table 2. Clinical presentation and laboratory results of BD patients with and without ATB Table 3. Potential risk factors for ATB in BD patients Conclusion When BD patients have fever, night sweating, unexplained weight loss, or manifestations rarely occurred in BD, the diagnosis of ATB should be considered. Significantly elevated T-SPOT.TB indicates a high risk of ATB in BD patients. Disclosures All Authors: No reported disclosures

1650. Clinical Features and Risk Factors of Active Tuberculosis in Patients with Behçet’s Disease