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Journals & Books Search Register Sign in View PDF Download full issue Search ScienceDirect The Lancet Public Health Volume 5, Issue 8 , August 2020 , Pages e452-e459 Articles Impact of delays on effectiveness of contact tracing strategies for COVID-19: a modelling study Author links open overlay panel Prof Mirjam E Kretzschmar PhD a , Ganna Rozhnova PhD a d , Martin C J Bootsma PhD a c , Michiel van Boven PhD a , Prof Janneke H H M van de Wijgert PhD a e , Prof Marc J M Bonten MD a b Show more Share Cite h
We evaluated the impact of timeliness and completeness in various steps of a contact tracing strategy using a stochastic mathematical model with explicit time delays between time of infection and symptom onset, and between symptom onset, diagnosis by testing, and isolation (testing delay). The model also includes tracing of close contacts (eg, household members) and casual contacts, followed by testing regardless of symptoms and isolation if testing positive, with different tracing delays and coverages. We