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The Infected

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"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. Like cinematic zombies, those present in the Left 4 Dead series attack human victims and will attempt to bite them, unless they are immune or a Carrier.

Characteristics

In the case of Common and Uncommon Infected, observed aggressiveness 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. The Infected primarily attacks uninfected humans who have attracted attention through noise, movement and displaying bright lights, or anything covered in Boomer Bile from a Bile Bomb. Common Infected are also frequently observed displaying mutual aggressiveness towards one another. However, these attacks cease when the Infected finds an uninfected human.

The Infection might also have changed their physiology. Some Infected suffer severe tissue damage and dismemberment from moderate blunt force, yet they can still jump down from heights of approximately 20 feet with perfect physical coordination and without harm. 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). Special Infected and Uncommon Infected tend to be less inert in their passive state since they are invariably observed to be in a standing position.

When active and stimulated, Common Infected display extremely contrasting characteristics, as their speed of movement is rapid, their gait is highly coordinated and focal direction unerring. Uncommon 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 eight varieties of these Infected, seven of which are playable. These eight varieties have special abilities in addition to doing more damage against the Survivors. In turn, two of these eight varieties are considered "Boss Infected", namely the Tank and the Witch.

Common Infected

Main article: Common Infected
Zombiegroup

A crowd of Common Infected in Left 4 Dead 2

Common Infected, as their name implies, are the most commonly faced enemy and are the easiest to defeat. They are more akin to the antagonists from the film 28 Days Later than to the typical shambling cinematic zombie. They are exclusively AI-controlled and fairly weak. Their strength lies in their tendency to attack in large groups of up to several dozen, known as Hordes.

However, the danger they pose must never be underestimated. Common Infected can easily bring down health on Expert as every hit drains health by 20 (10 if hit from behind), unlike Easy (1 from front, 0.5 from behind), Normal (2 and 1) and Advanced (5 and 2.5). While they seem capable of ignoring pain, they can still be killed easily. They are capable of climbing ladders and scaling objects, as well as breaking down weak walls and doors. They cannot break down safe room doors, so you should be relatively safe inside of a closed safe room. This type of Infected are attracted by flashlights, loud noises such as car alarms, or by Boomer bile. They appear to lack self-preservation, but do appear to have some intelligence, as in the Hard Rain or The Passing campaign; the Horde will attack when the storm picks up and there is minimal visibility.

Throughout Left 4 Dead, the physical appearance and dress of Common Infected are consistent with the particular location being visited. For example, in Mercy Hospital, they are medical staff, patients and maintenance personnel, whilst at Metro International Airport, Common Infected include flight, cabin and ramp crew plus business executives. In more neutral locations such as Riverside or Daughtery Farm, Common Infected appear as generic "everypersons," including servicemen wearing camouflage, blue collar and office workers and young adults through to late-middle-aged individuals of both genders. The same principle applies throughout Left 4 Dead 2, but given this game's diverse locales, the range of physical variation displayed is considerably wider relative to Left 4 Dead.

Horde

"Here they come!"
Louis
Hordes1280-x-1024

A horde as one would appear in the Farmhouse Finale.

Normal-infected

Common Infected attack in a horde.

A horde is a large group of Common Infected (sometimes Uncommon Infected included) that will rush the Survivors either at random intervals, during the finales, as a response to Boomer bile/bile bombs, or in response to loud, high-pitched noises and/or bright lights (car alarms, most alarms or noises during Panic Events, pipe bombs). Common Infected are weak when alone, but are strong in number. Be alert and prepared when you hear the music cue of an incoming Horde. The Horde can easily bring down any uncoordinated team, especially on Expert, as they like to attack from behind to surprise Survivors. Always watch your back when a Horde attacks.

Uncommon Infected

Main article: Uncommon Infected

Left 4 Dead 2 introduced six special types (seven counting Jimmy Gibbs Junior) of Common Infected known as "Uncommon Infected". Each Uncommon Infected is unique to the campaign it appears in and has its own special ability that make them slightly to moderately more dangerous than Common Infected.

Dead Center features the CEDA Worker Infected (which are immune to fire and may have bile bombs attached to them) and Jimmy Gibbs Junior (who is immune to fire and has significantly increased health, though still dies instantly to headshots). The Passing features the Fallen Survivor (who may carry a first aid kit, Molotov, pipe bomb or pain pills and has increased health). Dark Carnival features the Clown Infected (which have squeaky shoes that attract nearby Common Infected). Swamp Fever features the Mud Men (each hit slightly blinds a Survivor's vision, they also crawl swiftly around on all fours). Hard Rain features the Worker Infected (who have earmuffs, so they don't chase Pipe bombs and strangely, are immune to the attraction of the Bile bomb, but only if it doesn't hit an Infected. They also wear hardhats, making them mostly immune to headshots). The Parish features the Riot Infected (who can only be killed by attacking them from behind due to their body armor).

Special Infected

The Special Infected have been heavily mutated by the Infection, giving them each unique special abilities. Four of these Special Infected (namely the Hunter, Smoker, Charger, and Jockey) are "pinners", as when they attack you, they "pin" you, requiring another Survivor to knock them off (or in the Charger's case, kill them) for the trapped Survivor to be free. The Special Infected have higher intelligence than the Common Infected, as they are not attracted by car alarms or loud noise and are able to run away if required to set up an ambush.

They are also more aggressive than the Common Infected, as they will actively attack Survivors rather than passively sitting in a stupor until disturbed (except for the Witch and the Tank, which will wait for the Survivors to alert or attack them). The Director is able to spawn them at almost any time according to the difficulty and how the Survivors are doing.

Specials s

Seven of the Special Infected are playable by human players in the following gameplay modes:

Playable

Boomer

Boomeridle 1
Main article: The Boomer

The Boomer is a Special Infected that vomits a special bile at Survivors, which temporarily blinds them and draws a Horde of Common Infected to them. At a distance the Boomer isn't much of a threat; his large size and low health make him an easy target against any weapon at mid or long range. However, if within range, he can vomit on Survivors, attracting the Horde.

When he dies, he explodes, covering any Survivors who are close enough with bile, blinding them and causing them to stumble backwards. The Boomer is notorious on the Expert difficulty for being able to snipe Survivors. Boomers can be anticipated because of the near-constant gurgling they make. In Left 4 Dead 2, there is also a female Boomer, although the gender has no effect on gameplay.

Hunter

Hunter 1
Main article: The Hunter

The Hunter is a Special Infected that has the least visible mutations, and can be mistaken for a Common Infected. The Hunter is extremely fast and agile, capable of quickly scaling walls. Additionally, he can pounce and pin down Survivors, clawing at their abdomen until either the victim is dead or the Hunter has been knocked off or killed by another Survivor. They are not the most physically robust Infected, having relatively low health, and thus it doesn't take very much to kill them.

When the Hunter crouches down in preparation to pounce, he growls, giving himself away to any nearby Survivors. However, whilst standing, he makes no noise. The Hunter is the only Special Infected that can remain absolutely silent. In Left 4 Dead 2, they can be killed with a melee weapon while in the state of pouncing by aiming upwards and hitting, although this is fairly difficult, as timing is vital and it's easier to kill them from a distance with a high-powered primary weapon.

Smoker

Smokeridle
Main article: Smoker

The Smoker is an ambush class that can strangle Survivors with his long tongue, similar to Half-Life's Barnacle. The help of another Survivor is required to escape from a Smoker's hold (though if quick enough it is possible, though difficult, to kill a Smoker who has already grabbed you, earning an achievement). As the name implies, Smokers emit smoke when killed to impair Survivors' vision.

A Smoker also will frequently cough, letting the Survivors know when he is in the area. The Smoker can drag players that he has captured with his tongue towards himself, though he remains stationary and cannot move. The Smoker is also momentarily paralyzed for a few seconds after having his tongue removed from his captive by another Survivor. In Left 4 Dead 2, the Smoker has six tongues, but this has no effect on gameplay.

Tank

Tankidle
Main article: Tank

The Tank is the biggest and strongest of all the Infected and is reasonably fast, only slowing if hit with large amounts of automatic weapons fire or when lit on fire (Versus in Left 4 Dead only and any mode aside Versus on Left 4 Dead 2). He is the only player-controllable "Boss Infected." If any Survivors at 40% or above health (including health gained from pain pills or the Adrenaline Shot) are running away from the Tank, it will not be able to catch them, as they can run slightly faster (unless the Tank in question is an AI Tank in Left 4 Dead).

The Tank has incredible strength and resistance―his punch can send Survivors flying, rendering them temporarily defenseless, and in Expert mode, instantly incapacitate them. The blow can send Survivors off high hazards to their deaths. He is also capable of throwing chunks of concrete that he rips out of the ground to momentarily stun Survivors and dealing the same damage as a punch from a Tank. It can also punch large objects (e.g. a car) in the direction of Survivors with enough force to incapacitate them instantly.

Nevertheless, the Tank will die within 30 to 45 seconds if set on fire (varying with the difficulty), except in Versus. When controlled by a player, the Tank has a "Control Meter"; unless the player is able to locate and hit one of the Survivors, the Control Meter of the Tank will slowly lessen, and once it runs out, the player will lose control of the Tank to another randomly assigned player. When idle, the sound that a Tank makes is heavy breathing. The Survivors are alerted of an approaching Tank by dramatic music, furious roars and, when he is dangerously close, the screen will start to shake. The Tank's Music Cue

Charger

Charger 2
Main article: Charger

The Charger is a Special Infected that appears in Left 4 Dead 2. The Charger's main attack is charging forward and plowing into the Survivors. On a successful charge, he will grab and carry a single Survivor while knocking down the others. Once the Charger has hit a wall or other surface, or after he has run a certain distance, he will begin slamming his captive into the ground until an ally frees them. If he misses and hits a wall, he will stumble, leaving him open to attack.

The Charger can be detected by the Survivors by the warped growling noise he makes. He will announce his charge with a loud bellow. The Charger appears to have a rocky or calloused surface on his larger right arm, which may be what he uses to inflict most of his force when charging, while his other arm appears to have no bones or muscle.

Because of his hulking size, the Charger cannot be shoved off with melee, and must be killed in order to release his victim. If a Survivor has explosive rounds, they will dislodge the Charger from the Survivor and stumble him. Any Survivor that has been knocked out of the way during his charge will fly a considerable distance and slowly stand back up, making the Charger a deadly foe in cramped hallways or near high passageways. He is also the strongest and most durable of the Special Infected (excluding the Tank and the Witch); additionally, his melee attacks are very strong and can easily incapacitate a weakened Survivor.

Jockey

Jockey
Main article: Jockey

The Jockey is a Special Infected that appears in Left 4 Dead 2. He is a small Infected that attacks Survivors by clinging to them from behind and literally riding the Survivor while attacking them. He can shift his weight around and cause the Survivor to stumble in his desired direction, giving this Special Infected a type of control over the Survivor.

Survivors who are being ridden by the Jockey can attempt to "resist" the Jockey, which will allow other players a chance to catch up and knock the Jockey off. Jockeys can ride Survivors into dangerous situations, such as into natural hazards, Witches, or other Infected; a Jockey can also pull a Survivor off of a ledge, causing them to become incapacitated, or riding them to their death if they are not resisting. The Jockey seems to have a spinal disease, similar to kyphosis, giving him a hunched appearance. He also has a maniacal laugh and is constantly twitching, giving him a sort of hyperactive nature.

Spitter

Spitter 2
Main article: Spitter

The Spitter is a Special Infected in Left 4 Dead 2. She possesses the ability to spit a green ball of acid from long distances, which, upon hitting the ground, will expand into a large puddle and damage any Survivors who make contact with it. After spitting, however, the Spitter is temporarily paralyzed for a second, giving the Survivors a chance to kill her.

The longer the Survivor stands in it, the more damage the Survivor takes from the goo. This ability allows the Spitter to aid other Special Infected; for instance, if a Hunter pounces a Survivor, a Spitter can spit upon that Survivor, causing even more damage. However, in spite of such a useful ability, the Spitter is very weak in terms of health, so taking out a Spitter will be an easy task.

Upon death, the Spitter leaves a similar, smaller kind of puddle that has the same effect on the Survivors. She is one of the most powerful Infected if Survivors are caught standing in her spit, and are too distracted to move quickly due to other Infected or a lack of awareness at damage being dealt. On Scavenge Mode or any finale requiring gas cans, when they are dropped, the spit will ignite them if left in the goo long enough.

Computer-Controlled

Witch

Witch 2
Main article: Witch

The Witch generally only appears a few times per campaign, and is passive unless provoked by flashlights, gunfire, or Survivors in close proximity. She is the second "Boss Infected." Pistol fire does not provoke her easily, but it will do only a small amount of damage (in Left 4 Dead 2, causing any damage to the witch will instantly startle her). She is very powerful, capable of incapacitating, and even killing Survivors with one hit. When the Director spawns a Witch, the faint chord of the Witch music will play, allowing veterans of the game to quickly prepare for the "obstacle."

The Witch cries loudly. When nearby, Survivors will mention they hear her and warn teammates to turn off their flashlight. While the Witch can be killed, its' increased health makes this difficult. Witches can be startled if a survivor stands too close to her, damages her, or shines their flashlight on her from a close to moderate distance.

The Witch is very rarely found in small rooms and normally stays off the main route, but has been found in front of safe rooms (or even inside the safe room), doorways, and in the middle of streets. Once a Witch has killed a Survivor or cannot pathfind to her target, she will retreat from the area and despawn. However, in some strange cases, the Witch has been known to kill the closest Survivor to her. This does not usually happen, and when it does, the Witch runs off as normal after killing the Survivor.

Also, if a Survivor blocks the Witch from attacking the Survivor who startled her, she will attack the Survivor blocking her and either incapacitate the blocking player and run away or incapacitate (or kill on Expert or non-easy Realism mode) both the blocking player and the player who startled her. If the Witch is lit on fire (Molotov, Incendiary ammo, Gas can) while she is chasing a Survivor, she will immediately start chasing after whoever burned her.


Wandering Witch

Witchwander
Main article: Wandering Witch

The Wandering Witch appears in Left 4 Dead 2. She is seen only in the daylight hours, aimlessly wandering around and sobbing loudly with her head in her hands. Her constant movement makes The Wandering Witch harder to avoid, but she is also far more introverted and reacts only to direct attacks or physical contact. One can even damage her slightly without startling her. Unlike the sitting Witches, she does not seem to be alerted more readily by flashlights.

In Left 4 Dead 2's Hard Rain campaign, a large number of Wandering Witches have infested an abandoned sugar mill, which the Survivors must traverse to obtain fuel for their rescue boat. An achievement, Sob Story, is earned for navigating the sugar mill without startling any of them.

Known Infected Individuals

  • Carolyn (Zoey's mother): Turned into Common Infected minutes after being bitten.
  • Jimmy Gibbs Junior : Turned into Common Infected (period of time unknown).
  • Lt. Mora : Turned after a few minutes, he was in transition of turning and was still able to hold a gun and speak some English; however, he sees Survivors as monsters (might not have been completely turned).
  • News Chopper 5 Pilot : Turned into Common Infected in mid-air after rescuing and encountering the Survivors. He was bitten prior to rescuing the Survivors, which resulted in Zoey shooting him as soon as he turned.
  • Sandra : Turns into a Common Infected (period of time unknown).
  • The Church Guy : turns into a Special Infected (Boomer, Hunter or a Smoker) one hour after being bitten.
  • Helicopter Pilot (Left 4 Dead 2): Turned into Common Infected in mid-air after rescuing the Survivors, making Nick shoot him.

Cut Infected

Screamer

Main article: Screamer

Originally, there was going to be a Special Infected named the Screamer. Wearing a straitjacket, he would run from Survivors, hide, then let out a scream attracting the Horde; but he was removed because game testers found it too difficult to locate and kill him before he could summon a Horde, and his ability was given to the Boomer's bile instead. However, in Left 4 Dead 2, there exists a type of Uncommon Infected called the Clown which can attract a small Horde of idle Common Infected around him with his squeaky shoes. In The Passing, there is a new Uncommon Infected referred to as the Fallen Survivor. When shot, the Fallen Survivor attempts to run away, much like what the producers had planned for the Screamer.

Leaker

A Special Infected called the "Leaker" was being developed. It had similar attacks as the Spitter and Boomer, and the ability to plant itself in the ground and act as a mine bomb. It was removed because the Survivors could run away from it, as the Leaker would alert the Survivors that it was planting itself. But, It is still possible to play as the Leaker with console commands by using "Map MAPNAME Versus", then typing in the console "boomer_leaker_chance" and a number between 0 and 1. You will know when you are a leaker if it says "You are a/the Leaker!", or if you explode on death and cause a small fire. [1]

Notes

  • All Special Infected except Tanks and Witches take 4 times damage when headshot by bullets.
  • It is still unclear who actually gave the Infected their names in-game. It was probably some external faction, as the Survivors from both games use the same names for them after initial encounters. Possible candidates include CEDA, the military, the media, an unrevealed faction, or even various Survivors, though it seems unlikely that the military would have given them these names because in the comic, the two guard soldiers ask if "the whiskey deltas are changing," suggesting they've never seen a Special Infected before.
  • Some of the names of the Special Infected, if not all, seem to have been assigned to them by CEDA or the government, and not by the Survivors themselves. For example, in Left 4 Dead 2, there is a poster early on in the Dead Center campaign with photos labeled "Boomer," and on the side of bile bombs there is a label stating that the jar contains "Boomer Excretion." When Rochelle speaks of Smokers, she says that they were called Smokers on the news. Witches are also referred to by name on a safe room wall in Hard Rain, stating that the Sugar Mill is "full of Witches". Also, when exiting the Sugar Mill safe room, the building opposite to it has a banner hanging from the roof with the text "Stay away, Witches!" Additionally, in The Passing, one of the graffiti remarks on a pre-infection piece, stating one of the prostitutes in an establishment had "become a Boomer."
    • These could also be cases of official sources catching onto and using more well-known epithets for the Special Infected; as the aforementioned examples are all from the second game, which takes place three weeks after the initial Infection.
  • Almost every Infected and deceased being in the game appears to have faded textures in comparison to the colorfully textured Survivors. This is probably to help prevent cases of mistaken identity between Survivors and Infected. It could also mean that the Infected are slowly dying, since a very sickly person can look pale, and dead bodies will lose color as the blood circulation stops.
  • At the Bridge finale in Left 4 Dead 2, if the player listens to the military conversation on the radio long enough, the pilot mentions seeing flashes on the west bank (i.e. the side with the Survivors on it). The other soldier asks if it was the Survivors or "Whiskey Delta" to which the pilot is unsure. Whiskey Delta is the term the military use for the Infected, though they also use the term Infected when they questioned the Survivors if they are immune. One of the possible responses is or along the lines of "Hell yeah we've fought zombies!", which they accept as the Infected, meaning they understand that the Survivors refer to the Infected as such.
    • It is fairly common knowledge that the military creates initials and acronyms out of the names of their enemies from the ICAO spelling alphabet. "Whiskey Delta" could be used to represent "Walking (or Wandering) Dead", i.e. Infected.
      • In the French version of the game, the military refers to Infected as "Mac Victor", M.V. being the initials of "Mort Vivant", the French translation of "Living Dead".
      • This is confirmed in Part Two of The Sacrifice comic, where one of the army men confirms that Whiskey Delta means "Walking Dead."
  • The Infected seem to have become much stronger in Left 4 Dead 2. For example, in normal gameplay, the Boomer stumbles much less when melee'd than in the first game, and on Versus mode, as a Special Infected, you can kill a Common Infected with one claw attack as opposed to the first game, where it took several claw attacks to kill a single Common Infected. [2].
  • The Special Infected that appear in Left 4 Dead have mutated further in Left 4 Dead 2. This is shown as the Smoker now has multiple tongues, the Tank has more muscles and less hair and the Boomer appears gorier. Also, the Hunter appears to have more boils and lesions than in the first game, as well as seemingly having clawed off much of its clothing. The addition of the new special infected in Left 4 Dead 2 also demonstrates this.
  • It appears that most of the Special Infected have some form of intelligence. Smokers and Spitters will often run when sighted, hinting at a sense of self-preservation or at least the knowledge that their attacks must recharge. Boomers and Hunters will often hide before attacking, but the Charger will just run straight into the Survivors without much intelligence or thought into attacking. A very important aspect of this is that most Special Infected ignore pipe bombs, car alarms, and other noticeable events.
  • All of the Special Infected (excluding The Tank where the only way to see his arm is by using the melee attack) are able to see their arms in first-person view. But most of them shouldn't, as they hold their arms in third-person view down or out of passive sight. Only the Charger and the Jockey hold their arms higher to see them.
  • The use of orange/yellow filtering for first-person view for the Special Infected in the original Left 4 Dead could have been inspired by the effects used to depict the the world through the eyes of the Infected in the film 28 Weeks Later, in which a similar orange/yellow filter effect was first used.
  • Oddly enough, there are no Infected animals. The closest thing to one are the dead cows found around certain campaigns in both games, such as Blood Harvest.
    • In the sound folder for both games [sound/player/pz/voice/attack] there are sound clips labeled "zombiedog_attack", meaning there could have been Infected dogs in gameplay, but that they were cut.
  • Human-controlled Infected can revive incapacitated Survivors through use of the same button that a Survivor would use in the original Left 4 Dead.
  • In Versus Mode, while playing as the Jockey in first person view, he seems to be as tall as the other Infected, but the Jockey is the shortest of the Infected.
  • Unlike the Common Infected, Special Infected do not lose body parts, even if with a chainsaw or pipe Bomb.
    • The only exception is the Boomer, which will lose his/her entire upper part of body upon death.

References

  1. http://www.oxm.co.uk/article.php?id=16546
  2. http://www.youtube.com/watch?v=4QKYeVvxb0o
The Infected
Playable
Introduced in Left 4 Dead Introduced in Left 4 Dead 2
Boomer nav Hunter nav Smoker nav Tank nav Charger nav Jockey nav Spitter nav
The Boomer The Hunter The Smoker The Tank The Charger The Jockey The Spitter
Non-Playable
Introduced in Left 4 Dead Introduced in Left 4 Dead 2 Cut Infected
Witch nav Common nav Uncommon Infected nav 70px-Screamer nav
The Witch Common Infected Uncommon Infected The Screamer

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