Replica: The Plague Trilogy Series by Marilyn Kaye

No one can identify the cause of the mysterious disease. There’s evidence that the bacteria infected human genes as much as a million years ago. Back in the prehistoric age. Back when dinosaurs roamed the land. Back when cavepeople communicated in grunts and gestures. And the bacteria has been dormant—until now.Amy’s refined genes make her immune to this terrible plague. But when someone close to her shows symptoms of the disease, Amy will do anything to help find a cure... moreNo one can identify the cause of the mysterious disease. There’s evidence that the bacteria infected human genes as much as a million years ago. Back in the prehistoric age. Back when dinosaurs roamed the land. Back when cavepeople communicated in grunts and gestures. And the bacteria has been dormant—until now.Amy’s refined genes make her immune to this terrible plague. But when someone close to her shows symptoms of the disease, Amy will do anything to help find a cure. The only way: traveling back to the time when it all began . . . less

Amy’s encounter with dinosaurs and cave dwellers—and aliens—was pretty wild. Now her quest to stop the spread of the infectious bacteria gets even more bizarre as she agrees to take another perilous voyage.A voyage inside a plague-ridden human body.If Amy survives being injected into this complex landscape where good cells are waging battle against bad cells, she could save millions of lives. But it’s a do-or-die world in there. . . .

The gripping conclusion of a Replica miniseries! Being perfect isn’t a big deal to Amy–until word gets out that she’s a clone. Now everyone shuns her, and she’s getting mad. She starts to believe that the organization has the right idea: The world would be a better place if only Project Crescent clones existed. With a little help, Amy gets what she wishes for. She enters a world where everyone is just like her. But even perfection has its flaws. . . .