The Hitchhiker Strain Series by Kellie Sheridan

It's month after the dead first began to walk. The miracle vaccine that was supposed to save us all has failed.Now, four teens fight to stay alive as a stronger, smarter breed of zombie begins to appear, threatening to end humanity for good.Four short stories, 11,000 words total.Prequel to Mortality (March, 2013).

After surviving a deadly plague outbreak, sixteen-year-old Savannah thought she had lived through the very worst of human history. There was no way to know that the miracle vaccine would put everyone at risk for a fate worse than un-death. Now, two very different kinds of infected walk the Earth, intent on nothing but feeding and destroying what little remains of civilization... moreAfter surviving a deadly plague outbreak, sixteen-year-old Savannah thought she had lived through the very worst of human history. There was no way to know that the miracle vaccine would put everyone at risk for a fate worse than un-death. Now, two very different kinds of infected walk the Earth, intent on nothing but feeding and destroying what little remains of civilization. When the inoculated are bitten, infection means watching on in silent horror as self-control disappears and the idea of feasting on loved ones becomes increasingly hard to ignore. Starving and forced to live inside of the abandoned high school, all Savannah wants is the chance to fight back. When a strange boy arrives with a plan to set everything right, she gets her chance. Meeting Cole changes everything. Mere survival will never be enough. less

The end of everything came quickly, but the road back is endless and full of heartbreak. After months of only death and loss, Veritas may be the answer everyone has been searching for—a cure. Savannah wants nothing more than to begin rebuilding, but with both the Initiative and the United Militia vying for power, there are no easy answers. Ending the threat for good could mean becoming something far worse than the monsters she is fighting against. The infected will not go quietly... moreThe end of everything came quickly, but the road back is endless and full of heartbreak. After months of only death and loss, Veritas may be the answer everyone has been searching for—a cure. Savannah wants nothing more than to begin rebuilding, but with both the Initiative and the United Militia vying for power, there are no easy answers. Ending the threat for good could mean becoming something far worse than the monsters she is fighting against. The infected will not go quietly. For Chelsea, the choice to step back into the world of the living is anything but simple. No miracle can erase the memories of the things she saw or the people she killed. While the girl she was struggles against the beast she became, Chelsea must make a choice—succumb or fight. less