Mainland China, Hong Kong and South Korea have turned to information technology to keep the rate of new cases down
quarantined at his parents’ house in the Hebei province in northern China for a month, Elvis Liu arrived back home in Hong Kong on February 23rd. Border officials told him to add their office’s number to his WhatsApp contacts and to fix the app’s location-sharing setting to “always on”, which would let them see where his phone was at all times. They then told him to get home within two hours, close the door and stay there for two weeks.
Their efforts, like others elsewhere, are experimental. They risk failure; they also risk adverse side-effects, most obviously on civil liberties. But around 2.5bn people have now been put on some sort of lockdown during the pandemic . Only a fraction of them have been or will be infected, and thus become immune. The rest, when they emerge, will need watching—for their own sakes, and for the sakes of those around them.
Phones need not just send data back to the government; they can also pass data on to third parties. China’s Health Check app, developed by provincial governments and run through portals in the ubiquitous payment apps Alipay and WeChat, takes self-reported data about places visited and symptoms to generate an identifyingcode that is displayed in green, orange or red, corresponding to free movement, seven-day and 14-day quarantines.
Google, which may well have more information about where people are than any other company around, says that it is exploring ways in which it could help modellers and governments with aggregated data. One example could be helping health authorities determine the impact of social distancing using the sort of data that allow Google Maps to tell users about how congested streets or museums are.
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