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Soldiers of the Swiss army wearing protective face mask looking at Android and iOS (Google and Apple) smartphone during a test of a smart phone app using Decentralized Privacy-Preserving Proximity Tracing (DP-3T) at the Swiss Federal Institute of Technology (EPFL) during the state of emergency of the coronavirus disease (COVID-19) outbreak, in Lausanne, Switzerland, Friday, April 24, 2020. Secure contact tracing could be a powerful tool to fight the spread of COVID-19. A unique, decentralized system developed as part of an international consortium, including EPFL and ETH Zurich, will soon be launched with the support of the Swiss Federal Office of Public Health. DP-3T proposes a secure, decentralized, privacy-preserving proximity tracing system based on the Bluetooth Low Energy standard. Its goal is to simplify and accelerate the process of identifying people who have been in contact with someone infected with the SARS-CoV-2 virus. (KEYSTONE/Laurent Gillieron)