exactly. do we have data about whether contact tracing of this kind ever worked? S.Korea started testing+tracing somewhere midway in their epidemic, far earlier

exactly. do we have data about whether contact tracing of this kind ever worked? S.Korea started testing+tracing somewhere midway in their epidemic, far earlier than where the epidemic is now in france, uk and USA. maybe other countries can benefit from this tracing, but it remains to be proved. In Singapore, which does well, apparently only 6% of ppl installed the contact tracing app. Israel seems to be using carrier data. People seem to be missing the forest in here https://www.theatlantic.com/ideas/archive/2020/04/contact-tracing-could-free-america-from-its-quarantine-nightmare/609577/ https://www.theatlantic.com/ideas/archive/2020/04/contact-tr... > Let’s start with China, where citizens in hundreds of cities have been required to download cellphone software that broadcasts their location to several authorities, including the local police. The app combines geotracking with other data, such as travel bookings, to designate citizens with color codes ranging from green (low risk) to red (high risk). High-risk individuals can be banned from apartment complexes, offices, and even grocery stores. Many human-rights advocates fear that what has been rolled out as a public-health app is moonlighting as a tool of government espionage and mass discrimination. > Next, let’s look at South Korea, a democracy that has arguably been more successful than any other in containing the spread of the virus. The government uses several sources, such as cellphone-location data, CCTV, and credit-card records, to broadly monitor citizens’ activity. When somebody tests positive, local governments can send out an alert, a bit like a flood warning, that reportedly includes the individual’s last name, sex, age, district of residence, and credit-card history, with a minute-to-minute record of their comings and goings from various local businesses. “In some districts, public information includes which rooms of a building the person was in, when they visited a toilet, and whether or not they wore a mask,” Mark Zastrow, a reporter for Nature, wrote. “Even overnight stays at ‘love motels’ have been noted.”