Infected (Left 4 Dead)

Description

 * "I'll see peace back on Earth if I've gotta murder every one of these animals with my own bare hands!"
 * ―Bill
 * "It's them or us!"
 * ―Coach

The Infected are Left 4 Dead's take on the classic movie and pop-fiction zombie. But rather than being undead, they are living humans who have been Infected by the Green Flu virus, causing massively increased aggression and loss of many higher brain functions such as speech and self-preservation. Unlike cinematic zombies, those present in the Left 4 Dead series attack human victims but do not attempt to eat them.

In the case of Common and Uncommon Infected (refer subsections below), observed aggression manifests itself primarily in the form of frenzied physical blows and kicks. Bite attacks are of a secondary nature and may even be incidentally delivered. Attacks are invariably directed towards uninfected humans who have attracted attention through noise, movement and displaying bright lights. It is unknown whether other sensory stimuli such as smell or color variation trigger attack responses. Common Infected are frequently observed displaying mutual aggression towards one another; however, these exchanges lack the intensity and ferocity of attacks on uninfected humans and have never been witnessed as a collective Horde.

Common Infected share a remarkable physiology. They suffer instant fatal tissue damage (even dismemberment) from moderate blunt force, yet they can jump down from heights of approximately 20 feet with perfect physical coordination and without harm (refer below). They have no fine motor control and their gross motor control functions are heavily degraded, thus rendering them incapable of picking up objects and operating simple mechanisms such as door handles.

When passive and unstimulated, Common Infected lean against a support (such as a wall), sit, lie recumbent or stagger aimlessly in short uncoordinated steps. Many will vomit profusely or display visual signs of being unwell (e.g. slumped over cradling the head). Uncommon Common Infected tend to be less inert in their passive state since they are invariably observed to be in a standing posture.

When active and stimulated, Common Infected undergo a rapid transformation during which their speed of movement is rapid, their gait is highly coordinated and focal direction unerring. Uncommon Common Infected display the same behavioral qualities with the exception that they appear to be more sensitive to external stimuli and are thus more easily aroused and provoked.

Through some unknown mechanism, a small percentage of Infected humans will undergo a dramatic mutation, eventually turning into one of the Special Infected. There are nine varieties of the Infected, seven of which are playable. Eight varieties are considered "Special Infected," which have special abilities in addition to doing more damage against the Survivors. In turn, two of these eight varieties are considered "Boss Infected."

(from The Left 4 Dead Wiki)

Battle
TBA