Taiwan: Leveraging big data, real-time alerts, and fast response

Taiwan's response to the coronavirus has kept the country's level of cases extremely low. Building on its experience from the 2003 SARS outbreak, the country immediately responded when the first news of the outbreak in China appeared with numerous measures that leveraged its national insurance data, immigration and customs data, real-time alerts based on travel history and symptoms, QR code scanning, and proactively sought out patients with severe respiratory symptoms who had tested negative for flu. 

Sources:

https://jamanetwork.com/journals/jama/fullarticle/2762689
https://www.nytimes.com/reuters/2020/03/11/technology/11reuters-health-coronavirus-privacy-explainer.html