Effectiveness of Isolation, Testing, Contact Tracing, and Physical Distancing on Reducing Transmission of SARS-CoV-2 in Different Settings 17 Jun, 2020 | 02:47h | UTC Effectiveness of isolation, testing, contact tracing, and physical distancing on reducing transmission of SARS-CoV-2 in different settings: a mathematical modelling study – The Lancet Infectious Diseases Commentary: Case isolation, contact tracing, and physical distancing are pillars of COVID-19 pandemic control, not optional choices – The Lancet Infectious Diseases