The social and proximity network defines the graph. The green, yellow, red color code at time T1 defines each node’s reported status. And the most recent test result updates the color on that node at time T2.
Disease reservoirs seen on a screen as clusters of yellow & red codes.
If you can innovate in the physical world at literally 100X the pace or scale of others, new tactics become possible.
The virus lives in people. Make viral reservoirs visible & centrally quarantine the positives. Repeat till no more reservoirs. Then on to the next city.