The Fireman by Joe Hill
The world is being decimated by a plague known as Dragonscale. Harper Grace, our heroine, is a nurse who tries to help those infected. She contracts the disease which presents as scales on the skin and results in self immolation. Her husband blames her for giving him the disease and tries to kill her. She is saved by a small group of survivors that show her how the disease isn't what she thinks it is.