Queflings

Quefling is a slang term for those infected with a mysterious disease.

Summary
The virus that swept through the world, killing billions of people was not 100% fatal. Though close, in actuality it was closer to 95% fatal. The five percent that didn't die were carriers of the disease, living vessels for the virus. Though they are easier to kill than the undead, they possess several characteristics that may even make them more dangerous.

Charecteristics:
Queflings can run at a full sprint for several yards, as they feel no pain and will only stop when either their pray dies or they do. As previously stated, Queflings don't feel pain, they only let up in death. Queflings operate under the same instincts as zombies, "spread the virus." They attack any human on sight, biting them as a zombie would. Where as eating does nothing to a zombie, Queflings still require food and water to survive. As time passed after the initial downfall of humanity, they stopped biting a healthy human and letting them get infected, they began eating every single part of the human. Also, if no healthy human has been spotted in a while and the horde is hungry, often the weakest quefling will be cannibalized. Queflings still possess some small bit of learning capabilities, they know they need to drink water and other basics of survival. They can learn to avoid traps over time if other Queflings have fallen into them before. Queflings have been known to live several years in the wild and a few have been recorded to live over a decade in captivity. Queflings know to drink water and eat food. Often they act as scavengers, eating already dead animal and human carcasses. They have also been trained to eat vegetables or fruits in captivity. If another Quefling dies within a horde, the surrounding Queflings often quickly descend upon it and cannibalize it. If a horde begins to starve an individual may be killed to feed the rest. The choice appears to be completely random. Queflings however do not reproduce through sex, only through infection. Though they are technically humans, whatever prevents zombies from attacking one another also appears to work on Queflings. Infections can be developed over time, all they require is close contact with the zombie virus, and a trigger. If bitten by a Quefling it appears there is nearly a 50% chance of turning, otherwise the person can just become sick for a few weeks. Note that if a person is bitten by a Quefling upon death they will return as a zombie.
 * They are fast:
 * They Feel no pain:
 * They are cannibalistic:
 * They can learn:
 * They still possess basic survival instincts
 * Queflings are not targeted by zombies
 * It is easy to become a Quefling