Responses to Covid-19 have largely been led by local, national, and international public health agencies, who have activated their pandemic plans and opened the epidemiological toolkit of modeling, testing, isolation and movement restrictions, surveillance, and contact tracing. When it comes to contact tracing, it's natural for people to see the tech-heavy world around them, then hear about the common manual process of human investigators and phone calls, and ask, "Why can't technology help make this better?" But it's not as simple as "add more technology." The complex way in which users and societies interact with the technology has significant…
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