Fever cure - make the strange concoction following the guide, then leave the front door.
Fervor cure - make the foul concoction, spread on both windows, leave through the front door.
Escape through window - leave through the window.
The variations are:
No cure - you're killed by the townspeople regardless if you leave the front door.
high fever, low fervor - you die of plague shortly after leaving the house.
high fervor, low fever - you go crazy and start burning heretics at the stake.
high fever, high fervor - you probably just die of the plague. Can't remember this one.
Escape through window with no supplies - you die of exposure.
Escape through window with water/wine and coins - you survive and run away.
Secret ending - throw everything into the firepit. After a certain number of items it triggers the house burning down. By default you die in the fire; however, if you unlock the window and open it you escape and stop the spread of the plague. You live a full life and nobody ever finds out :')