Officials say the risk can be further reduced by ensuring any infected member of staff takes medication to reduce their virus count, which means it cannot easily be passed on.

Now, the number of staff has risen to the dizzy heights of "two or three, depending on how you count it", says Schroepfer.

Backroom and shelf management: Automating inventory count and notifying staff to refill shelves (back room or in store) to avoid out-of-stock situations.