Nice, I think they did something similar in China.<p>Cherry on top of the cake would be to provide an app, where people could voluntary agree to anonymous location tracking and for their COVID-19 status to be updated by health authorities (or themselves in case they already know).<p>Having that, I think it wouldn't be too complicated to alert other potentially not infected people that someone that has been exposed to the virus was nearby.<p>Once someone was diagnosed as being infected, would could taint and steralize all the locations this person visited in the X number of days prior.