The Omega Strain

Meet Mitch Herron: unstoppable assassin and biological nightmare. 
Herron's business is death and business is good. Though he's an assassin without equal, his latest job is no walk in the park. Fanatics hell-bent on cleansing the planet ambush Herron and turn him into a walking bioweapon. 
With only days before he's used to spread the most lethal contagion in human history, Herron can surrender himself to quarantine or hunt down the fanatics, knowing he might be the only person who can. 
The clock is ticking...