COVID-19 contact tracing in the hospitals located in the North Denmark region: A retrospective review

Author:

Fromberg Dorte1ORCID,Ank Nina1ORCID,Nielsen Hans L2ORCID

Affiliation:

1. Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark

2. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark

Abstract

Background The Department of Infection Control, at our University Hospital conducted contact tracing of COVID-19 positive patients and staff members at all hospitals in the North Denmark Region. Aim To describe the contact tracing performed during the COVID-19 pandemic in the Region and its outcomes. Methods Data from each contact tracing were collected prospectively during 14 May 2020–26 May 2021. Data included information about the index case (patient or hospital staff member), presentation (asymptomatic vs symptomatic), probable source of transmission (community-acquired or hospital-acquired), number of close contacts and if any of these were SARS-CoV-2 PCR-test positive. Findings 362 contact tracing were performed. A total of 573 COVID-19 positive cases were identified among 171 (30%) patients and 402 (70%) staff members. 192 (34%) of all cases were tested due to symptoms of COVID-19, whereas two-third were tested for other reasons including outbreak and systematic screening tests. A total of 1575 close contacts were identified, including 225 (14%) patients and 1350 (86%) staff members. 100 (6%) close contacts, including 24 patients and 76 staff members, were infected with SARS-CoV-2, of which 33 (43%) staff members was positive at day 0 i.e. the same day as being identified as close contacts. Discussion We found a three to one of close contacts to each index case, but only 6% became SARS-CoV-2 positive, with a surprisingly high number of those identified at day 0. Our data confirm that regular testing of patients and staff will identify asymptomatic carriers and thereby prevent new cases.

Publisher

SAGE Publications

Subject

Infectious Diseases,Advanced and Specialized Nursing,Public Health, Environmental and Occupational Health,Health Policy

Reference24 articles.

1. Bidirectional contact tracing could dramatically improve COVID-19 control

2. Specific risk factors for SARS-CoV-2 transmission among health care workers in a university hospital

3. ECDC (2020) Contact tracing: public health management of persons, including healthcare workers, having had contact with COVID-19 cases in the European Union. Available at: https://www.ecdc.europa.eu/sites/default/files/documents/Contact-tracing-Public-health-management-persons-including-healthcare-workers-having-had-contact-with-COVID-19-cases-in-the-European-Union%E2%80%93second-update.pdf (accessed 5 May 2021).

4. Mechanisms of SARS-CoV-2 Transmission and Pathogenesis

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