Books in Creepers series

After an astronaut becomes host to an extraterrestrial virus in space and is transported back to earth in a vegetative state, the most advanced medical minds in the United States are perplexed as their patient undergoes a dramatic transformation. Then everything changes. The patient awakens and begins to savagely attack everyone in the hospital, commencing the rapid spread of the virus. Just five years later, humans are almost nothing more than a distant memory. Instead the virus has transformed them into creepers: mindless predators that savagely hunt and kill. In an apocalyptic New York City, brothers Jason and Drake Bennett fight for survival everyday while creepers constantly hunt through the city streets. When news of a potential survivor colony reaches the Bennett brothers, they decide to travel across the decimated United States, but the journey pushes them to the brink of sanity and forces them to test their physical limits while searching for the remnants of humanity and a way to beat the virus.