Devil's Wake by Steven Barnes and Tananarive Due

What happens when an unprecedented infection sweeps the world, leaving the earth on the brink of the Apocalypse?  This infection goes byond any disease.  The infected are turning into creatures only from our worst nightmares.  Trapped in the north western United States as winter begins to fall, Terry and Kendra have only one choice: they and their friends must cross many miles across a very dangerous landscape battlin the walking dead, human raiders and their own fears.  In the midst of all this they find something no one could have anticipated...love.