Edenborn — Nick Sagan

Eighteen years ago, the microbial apocalypse christened Black Ep had virtually wiped humanity from the globe. The survivors of the epidemic have now reached adulthood and are committed to the task of rebuilding civilization. But an ideological rift has divided the survivors into two separate factions -- one determined to resurrect the human race, the other obsessed with improving humanity via genetic manipulation.
 
And as the factions clash with one another, a new biological threat rises from the ashes of Black Ep, an even deadlier contagion with one purpose: mankind's extinction.
 
“A compelling work that will appeal to fans of speculative fiction and apocalyptic thrillers.” -- Midwest Book Review