Testing and contact tracing are important after lockdown measures lifted

https://www.thelancet.com/journals/lanpub/article/PIIS2468-2667(20)30157-2/fulltext

To improve on contact tracing effectiveness: reducing the testing delay is the most important factor; reducing the tracing delay might further enhance the effectiveness. The effectiveness of mobile app-based contact tracing declines with lower app use coverage, but it remains more effective than conventional contact tracing even with lower coverage, due to its inherent speed. 

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