Epidemiology and transmission of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China: a retrospective cohort study

Study of 391 COVID-19 cases found that contact tracing reduced time to isolation after symptom development by 1.9 days from an average of 4.6 days via symptomatic surveillance alone. However, authors highlight that the overall impact of contact tracing is uncertain.

SPS commentary:

A related commentary recommends that enhanced case finding and contact tracing should be part of the long-term response to the pandemic and can help society move towards control of this pandemic.


The Lancet Infectious Diseases

Resource links: