Zombies

The Zombies of the Wake the Dead series are undead corporeal beings. They are incredibly strong, mindless and driven by hunger.

History
Twenty-one years ago, a plague of zombies brought the world to ruin. Seven years after the outbreak during the summer solstice, a large surge of zombies occurred. During that surge, zombies swarmed and consumed everything in their path. The following year, the zombie population returned to normal. Seven years after the first surge happened, a second surge occurred. This suggests that close to ninety percent of the zombie population is in hibernation at any given time, and surges happen like clockwork every seven years.

The zombies were caused by a parasitic organism that infects humans. Other animals do not become zombies and thus it can be assumed there are no intermediate hosts. The method of infection and replication within the hosts suggests that the parasite itself is a protozoan, similar in patterns to malaria.

Biology
General zombies are called drones. They have pale gray skin with outbursts of cysts, milky white eyes, and stringy hair. They have longer fingers with fingernails that have hardened into claws and sharper teeth than the humans they used to be. Their flesh and skin are decomposing, but the state of decomposition does not hinder their agility and movement. Due to their lack of eyesight, they rely on their senses of smell and hearing. They interact with each other through pheromones. They appear to have the ability to be "trained" to look for food in certain areas.

Upon closer inspection, their jaws have stretched muscles that enable a larger bite. Although they possess a greater strength than their emaciated frames would suggest, a full examination of internal organs shows severe decay.

Microbiology
Currently, there is no cure against the zombie parasite, no way to turn a zombie back into a human nor a vaccine to prevent humans from becoming zombies once they are bitten. It appears once a human is bitten, the human always becomes infected and has over a 95% chance of becoming a zombie unless he/she is killed before the transmutation occurs.

The parasite is found primarily in the blood and saliva of infected individuals. Immediately after a bite, the parasite enters healthy cells near the infection site, multiplying until the host cells burst and release new parasites into the bloodstream. From the bloodstream, the parasite quickly spreads to all major organs including the brain. Saliva concentrations of the parasite are exponentially higher than concentrations in the blood, suggesting bites are the only reliable means of transmission. The parasite cannot survive outside of the body for more than a few minutes. Healthy individuals exposed to infected blood are unlikely to become infected unless the blood enters the mouth, eyes, or an open wound.

Data implies that the zombie parasite controls its host by infecting the brain, reminiscent of the Ophiocordyceps camponoti-floridani fungus found in ants.

There are a few cases that a victim can fight off the infection. It is unclear how, though some claim certain medications can aid in the fight.

General
In addition to the common drones, there are other types of zombies. Research from Shannon Fox explains that this is caused by a mutation within the parasite itself, rather than a different kind of parasite.

Scouts
Scouts are variants of drones that have evolved into more powerful zombies. They possess a much larger mouth with a huge tongue, possibly as a way to more easily spread the parasite. The Scouts appear to have ripped out some of their internal organs, as they are missing their kidneys, liver, and parts of their intestines; however, they also have increased muscle mass. They are extremely fast and incredibly dangerous. They have the ability to go off on their own, find a target and then call other zombies to that location with a very loud shriek.

Soldiers
Soldier zombies are monstrous and gigantic-sized versions of the scouts, with vast mouths, forked tongues, red pustules, and colossal muscles. The soldier you fight in Chapter 12 is the size of a warehouse, indicating their enormous power and strength.

Sirens
Sirens look the most human of the zombies, as their faces remain largely intact save for a seam bisecting their chins and cheeks, which serves as a second mouth. They hypnotize their prey by humming and secreting a pheromone while standing still in order to feign an impression that they're not a zombie from a distance.

Appearance

 * -|Normal Zombies=

Powers and Abilities

 * Zombie Physiology : These zombies are flesh-eating and plague-bearing creatures.
 * Enhanced Strength
 * Immortality: These zombies appear to have an endless lifespan and cannot die of their own accord. Zombies can also survive what would be fatal trauma to a human. For example, one zombie which lost both of its legs was still able to clamber around.
 * Infection: They can infect humans by passing the parasite into the bloodstream.
 * Powerful Bite: The zombie's jaw distends, allowing for a far greater bite size that can easily tear through flesh.
 * Enhanced Sense of Hearing
 * Enhanced Sense of Smell
 * Piercing Shriek: Scout zombies can emit a very loud shriek that will call other zombies to their location.
 * Hypnotism: Siren zombies hypnotize their prey by humming and secreting a pheromone.

Weaknesses

 * Decapitation
 * Fire: According to Angel Savage, zombies will burn at the same temperature as humans. Fire and other explosions kill them easily.
 * Night Blindness: They are unable to see well in poorly lit areas.
 * Pheromones: Zombies communicate through pheromones, and synthetic versions can be created. A pheromone of fear will cause a zombie to panic and flee, even trampling each other and avoiding easy targets in their haste to escape.
 * Exposed Chest Cavity: Scout zombies have an exposed chest cavity where a direct hit will kill them.
 * Pustules: Soldier zombies have large pustules on their shoulders, upper arms, and back. These cause pain to the creature if ruptured.