There are 3 books in the Ashley Parker series. The newest book is Plague World which came out in 2014.

1
Plague Town

Book cover of Plague Town
Ashley was just trying to get through a tough day when the world turned upside down.

A terrifying virus appears, quickly becoming a pandemic that leaves its victims, not dead, but far worse. Attacked by zombies, Ashley discovers that she is a 'Wild-Card' -- immune to the virus -- and…
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2
Plague Nation

Book cover of Plague Nation
Sequel to the thrilling zombie novel "Plague Town". Ashley Parker was a ordinary woman who was also a "wild card," immune to the emerging zombie plague, drawn unwillingly into a shadowy paramilitary organization. Having stopped the wave of the undead that swarmed their facility, the worst is yet to come,…

3
Plague World

Book cover of Plague World
Having been ambushed in San Francisco, Ashley and the wild cards must pursue the enemy to San Diego. There they will discover a splinter of their own organization, the Dolofonoi tou Zontanous Nekrous, which seeks to weaponize the plague. But that isn't the worst news. The plague has gone airborne,…