| Summary: | Abstract Background and Aims During the first peak of the COVID‐19 pandemic, the Preventive Medicine Department and the Occupational Health Department at Hospital Clinic de Barcelona (HCB), a large Spanish referral hospital, developed an innovative comprehensive SARS‐CoV2 Surveillance and Control System (CoSy‐19) in order to preserve patients' and health care workers' (HCWs) safety. We aim to describe the CoSy‐19 and to assess the impact in the number of contacts that new cases generated along this time. Methods Observational descriptive study of the findings of the activity of contact tracing of all cases received at the HCB during the first peak of COVID‐19 in Spain (February 25th‐May 3rd, 2020). Results A team of 204 professionals and volunteers performed 384 in‐hospital contact‐tracing studies which generated contacts, detecting 298 transmission chains which suggested preventive measures, generated around 22 000 follow‐ups and more than 30 000 days of work leave. The number of contacts that new cases generated decreased during the study period. Conclusion Coordination between Preventive Medicine and Occupational Health departments and agile information systems were necessary to preserve non‐COVID activity and workers safety.
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