Did you have a month of plague? It keeps appearing for me, even though I've tried rolling back and replaying in 141 different ways. It feels like it's somehow hardcoded into the map and can't be avoided. I'll try continuing with the plague.
Although, I see that if you play with HD+, there's no plague (but that's not really fair).
upd
No, everything's fine, I went back to the beginning of the week, played carefully, and avoided the plague.
A month of plague is something that cannot be hardcoded into a map (for SOD, of course), so avoiding the month of plague is fair play in any way.