JAMES CHENG-CHUNG WEI2026-10-162026-10-162022-10-01Pure ID: 15103763Pure UUID: 1583e898-c37a-448d-8764-0ba0c295779510.1177/17474930221079163https://www.scopus.com/pages/publications/85126209937https://scholars.csmu.edu.tw/handle/123456789/22538Background and purpose: In the era of easily available antibiotic use, this study provides epidemiological evidence for a re-examination of the relationship between syphilis and ischemic stroke (IS). Methods: Patients aged 18 years and older with newly diagnosed syphilis were included (n = 1585) from 2000 to 2012, and participants without syphilis in the control group (n = 6340) were matched by propensity score (age, sex, index year, insured amount, urbanization, seasons, and comorbidities). The Cox proportional hazard model was used to estimate the hazard ratio (HR) and 95% confidence interval (CI) of IS. Five different Cox regression models, sensitivity analyses, and negative control were conducted to test our findings. Results: In all, 1585 patients (1055 (66.56%) men; mean (SD) age, 49.59 (20.32) years) had syphilis, and 3.8% had new-onset IS. The syphilis group had a higher risk of IS than the controls (adjusted HR, 1.35; 95% CI, 1.01–1.80; p value < 0.05) after full adjustment. Serial sensitivity analyses yielded consistent results. Conclusion: Syphilis patients have higher risk of IS, and our data raise the question of implementation of prophylactic treatment for IS.9enjournal article