• Shu-Wan Jian, Hao-Yuan Cheng, Xiang-Ting Huang, and Ding-Ping Liu.
• Epidemic Intelligence Center, Taiwan Centers for Disease Control, Taipei, Taiwan. Electronic address: swjian@cdc.gov.tw.
• Int. J. Infect. Dis. 2020 Dec 1; 101: 348-352.

AimComprehensive case investigation and contact tracing are crucial to prevent community spread of COVID-19. We demonstrated a utility of using traditional contact tracing measures supplemented with symptom tracking and contact management system to assist public health workers with high efficiency.MethodsA centralized contact tracing system was developed to support data linkage, cross-jurisdictional coordination, and follow-up of contacts' health status. We illustrated the process of how digital tools support contact tracing and management of COVID-19 cases and measured the timeliness from case detection to contact monitoring to evaluate system performance.ResultsAmong the 8051 close contacts of the 487 confirmed cases (16.5 close contacts/case, 95% CI [13.9-19.1]), the median elapsed time from last exposure to quarantine was three days (IQR 1-5). By implementing the approach of self-reporting using automatic text-messages and web-app, the percentage of health status updates from self-reporting increased from 22.5% to 61.5%. The high proportion of secondary cases detected via contact tracing (88%) might reduce the R0 to under one and minimize the impact of local transmission in the community.ConclusionComprehensive contact tracing and management with complementary technology would still be a pillar of strategies for containing outbreaks during de-escalation or early in the next wave of COVID-19 pandemic.Copyright © 2020 The Author(s). Published by Elsevier Ltd.. All rights reserved.

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