This might be important :
App to Warn Users of #Coronavirus Cases.
A new Israeli app can instantly tell users if they have crossed paths with someone known to have been infected with the coronavirus.
For more info try searching “#HaMagen”, #Israel.
In Hebrew Ha magen translates as ‘The Shield’.
Or start by reading https://www.haaretz.com/israel-news/israel-unveils-app-that-uses-tracking-to-tell-users-if-they-were-near-virus-cases-1.8702055