In the weeks following the Omega Virus outbreak, survivors form desperate clusters, uniting to defend against hordes of the walking dead. But they can only hide for so long.

On a remote mountaintop in western China, a doctor and her team have created a terrifying new coronavirus called C-62 that is capable of killing a person in twenty minutes. But her conscience tells her she must destroy the deadly bioweapon before it can bring devastation to millions. The doctor's plans are interrupted when mysterious commandos swarm the lab, kill everyone in sight, and take off with the C-62 virus. Meanwhile, Eric Steele is on a cleanup...

"Sue Burke, author of Semiosis and Interference, gives readers a new near-future, hard SF novel. Immunity Index blends Orphan Black with Contagion in a terrifying outbreak scenario. In a US facing growing food shortages, stark inequality, and a growing fascist government, three perfectly normal young women are about to find out that they share a great deal in common. Their creator, the gifted geneticist Peng, made them that way--before such things...