The next development may well be an app that records how and at what exact moment you were infected. As you are standing on the tube the mint-green germs that drift across to you are registered on your device and the red light comes up: INFECTED. The device will then point out the infector: the man in the woolly hat with The North Face backpack. What happens next is that your potential lost earnings are instantly calculated by your remarkable device and an invoice is instantaneously sent to the inbox of the North Face infector. And perhaps the funds will move automatically between the two parties.