Symbiont
by Mira Grant
Orbit, 2014 (($26))

In this book, the second in Grant's Parasitology series of thrillers, a medical breakthrough is not all that it seems. Most of the world lives with implanted genetically engineered tapeworms that boost the immune system, protect against illness and secrete helpful drugs. The powerful biotech company behind the worms has an interest in keeping any risks under wraps, but a serious danger becomes public when a zombielike sleepwalking sickness begins infecting people. Now scientists who created the extraordinary worms have to grapple with a creation they can no longer control.