Abstract: Background: April 11, 2022, we learned from the public information platform that a COVID-19 close contact was tested nucleic acid in our hospital recently. This survey was performed to verify the information and timely identify high-risk population of COVID-19.
Methods: According to the National COVID-19 Control and Prevention Protocol (8th edition), and the Emergency Response Plan for COVID-19 in our hospital, information verification, close contact investigation, indirect contact tracing, information report and close contact follow-up were carried out by our team. Results: A total of 40 indirect contacts were identified. The basic information of those 40 indirect contacts was reported to the local Center for Diseases Control and Prevention. The close contact was followed up for 10 days, and the nucleic acid test results of COVID-19 of the contact were negative since then. No fever or other suspected symptoms of COVID-19 were appeared for the contact. Conclusion: Timely verify the COVID-19 related information, screening of high-risk population and dynamically monitoring of the close contact will help to control the potential spread of COVID-19.

Key words: COVID-19, close contact, indirect contact