You may be aware that various apps are being proposed to help track individuals that have tested positive for Coronavirus. 

Apple and Google are proposing a "decentralised" system where records of devices interacting with one another are stored on users’ phones. In this article, a coder with an interest in privacy describes how such a "decentralised" app could operate, and why it poses less risk to privacy than a "centralised" one powered by a single large database accessible by health authorities and/or governments.  

Of course, will a "decentralised" app be useful if it can't provide some further detail regarding the time, place and circumstances of an encounter with an infected individual?  A compromise between privacy and practicality is going to have to be struck.