The Wandering

When Rani Sulling wakes up in a ransacked research facility and discovers that the world is in tatters and that the human race is nearly extinct due to the virus 4X10O's spread, she knows she is in trouble.
Not only has she been exposed to this virus, but she knows that without finding other survivors and escaping the facility she will not only die, but will become one of them.

One of the Wandering.