Case Notes by Mitchell B. Weiss and Sarah Mehta: “By April 7, 2020, over 1.4 million people worldwide had contracted the novel coronavirus (COVID-19). Governments raced to curb the spread of COVID-19 by scaling up testing, quarantining those infected, and tracing their possible contacts. It had taken Singapore’s Government Technology Agency (GovTech) and Ministry of Health (MOH) all of eight weeks to develop the world’s first nationwide deployment of a Bluetooth-based contact tracing system, TraceTogether, and deploy it in an attempt to slow the spread of COVID-19. From late January to mid-March 2020, GovTech’s Jason Bay and his team raced to create a technology that would supplement the work of Singapore’s human contact tracers. Days after its launch, Singapore’s foreign minister announced plans to open source the technology. Now, in early April, TraceTogether was a beta for the world. Whether the system would really help in Singapore, and whether other countries should adopt it was still a wide-open question….(More)”.