How to win Outbreak scenario?

[Notorious]

What triggers the win condition for the Outbreak scenario?

I have now had two occasions when the scenario doesn't end, so I must be missing something.

I have killed all the monsters, healed everyone in town with symptoms by giving them healing potions, hacked away all the spider webs, even squashed random bugs on the ground.

What else do I need to do?

[Shadow]

In theory there is still someone that is infected.

[Notorious]

Everyone was already cured, but for some reason, the Win only got triggered when I exited the area and loaded it again. Perhaps it's a bug.

Another possible bug: after completing the area, and selecting "Load Different Area" it didn't actually load anything, just stayed in the current area. I had to "Save and Exit" then "Play" to load a different area.