East Sussex, UK, 17 July 2021: A mobile phone shows an NHS Covid app order to self-isolate due to possible coronavirus exposure, part of a 'Pingdemic' affecting hundreds of thousands of people. A ping means being instructed to self-isolate after coming into contact with, or attending a venue with, someone who has subesquently tested positive for covid. Business and society are being thrown into disarray due to large numbers of people being asked to self-isolate, causing some business to temporarily close and some people to delete the app. Anna Watson/Alamy Live News

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