I saw in the news that 3 TSA employees at SJC have been confirmed with Covid-19:
https://www.mercurynews.com/2020/03/...-for-covid-19/ :
...But TSA has so far declined to reveal any information about what those workers did at the airport — and therefore what kind of risk there was to the traveling public....
In small places like Singapore and Taiwan, the governments spend a lot of time tracking down contacts for confirmed cases. For example, Taiwan tracked down 419 people for a visiting musician from Australia who probably caught this in Europe (and was not confirmed until he returned to AU: ).
How would this work in the US - it is so big, people move all over, government is decentralized, no money, etc...