Left 4 Dead (abbreviated as L4D) is a cooperativefirst-person shooter arcade-style video game. It was developed by Turtle Rock Studios, which was purchased by Valve Corporation during development. The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and Mac OS X. Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. The digital retail disc version was released in North America and Australia on November 18, 2008; and in Europe and Japan on November 21, 2008.
Set during the aftermath of an apocalypticpandemic, the game pits its four protagonists—dubbed the "Survivors"—against hordes of the infected. There are four game modes: a single-player mode in which allied characters are controlled by AI; a four-player, co-op campaign mode; an eight-player online versus mode; and a four-player survival mode. In all modes, an artificial intelligence (AI), dubbed the "Director", controls level pacing and item placements, in an attempt to create a dynamic experience and increase replay value. Left 4 Dead was well received by the industry media upon its release, with praise given for its replay value, focus on cooperative play, and movie-like experience. Several criticisms were aimed at limited level selection and the lack of a narrative. The game has won several publication awards, as well as distinctions from the Academy of Interactive Arts & Sciences and British Academy of Film and Television Arts. As was done with Team Fortress 2, Valve supplemented the game with free downloadable content. The first, called the "Survival Pack", was released on April 21, 2009. The second piece of DLC was charged for on Xbox Live and came in the form of a new Campaign entitled "Crash Course," released for both the PC and Xbox 360 on September 29, 2009.
The popularity of the game led to the development of a sequel, Left 4 Dead 2, which was released November 17, 2009. Left 4 Dead 2 was released on Mac OS X via Steam on October 5, 2010, and the original Left 4 Dead was released for the Mac soon after on October 28, 2010. The Mac version of Left 4 Dead 2 incorporated a new map for both Left 4 Dead and Left 4 Dead 2, called "The Sacrifice". Eventually all Left 4 Dead campaigns were ported over to Left 4 Dead 2 and allowing for cross-platform support between Windows and Mac versions.CEDA have been involved in responding to the Green Flu epidemic. They have created advertisements alerting the public about the disease, tried to evacuate citizens from highly infected areas, and even researched the disease. Once they realized how powerful and virulent the Infection was, CEDA agents isolated themselves from the public in hazmat suits and decided to provide the public with face masks while trying to evacuate the public. Large-scale evacuations were called and required CEDA to bring in several Disease Emergency Assessment Dispatch trailers to help process people faster.
Throughout the campaigns, advertisements from CEDA can be seen advising citizens to wear face masks, wash their hands, and seal their windows and other openings with plastic sheeting and duct tape to prevent the spread of the Infection. At one point, CEDA began to inform the public on how to build saferooms and where to seek shelter as well as "Safety Checklists," which instruct residents to barricade themselves in their basements and wait for help to arrive. The posters displayed in game can be seen in the CEDA gallery below. In Left 4 Dead 2, CEDA also uses Solar Portable Message Signs to help with the evacuation. Instead of placing evacuation notices on buildings (as seen in Left 4 Dead), these trailers can be seen near highways and roadways informing any survivors to head to the location displayed on the digital sign.
CEDA was informing the public about the situation of the Infection, the spread of the virus, areas under quarantine, and ways of prevention of disease. The agency mainly used radio and television as the main media outlet source to inform the public. They mainly used emergency frequencies to update information to the public and the status of the evacuation centers in the areas. When approached by news crews and agencies, one of the CEDA teams in the South Atlantic Region (Region 3) in The Vannah were assigned to do a report (with Rochelle) and provide a statement and update on information. However, CEDA never told people how bad the Infection was spreading and how bad the situation was due to the mass panic and chaos it might provoke; therefore, this report never aired or occurred.
When the Infection was spreading out of control and the public started to find out the truth behind the Infection and how bad the situation was getting, everyone started to panic and began rioting, causing chaos. CEDA hired a private security firm to help with local law enforcement and the agency to help maintain control. The security officers wore protective gear such as helmets, bulletproof padding, and used nightsticks instead of firearms (due to CEDA Management Policies) to help maintain control of the public. They helped keep crowds organized and under control at evacuation centers while stopping rioters from causing chaos until the Infection hit. With the officers dealing with the public, it was difficult for them to tell who was infected and who wasn't; therefore, it was easy for the security officers to succumb to the Infection.
When the Infection first began, CEDA first tried to contain the virus by quarantining the infected individuals from the public by keeping them in isolated buildings. However, this method was unsuccessful. With the Infection raging out of control and multiple victims becoming infected, CEDA then had to take the next step of full town and city evacuations. CEDA then began setting up evacuation centers around major urban centers such as hospitals, arenas, or malls where people were "forced" to go and await further instruction. A CEDA representative would assess the evacuation centers and provide hourly updates over all radio frequencies of the current conditions; however, it is presumed that the infected individuals also made their way to those locations and quickly almost every evacuation center was overrun by the Infected. CEDA banners found at evacuation centers.
With the evacuation centers being overrun, it is rumored that CEDA either became infected themselves or that they have abandoned the public completely. The Survivors usually head for the nearest evacuation center in hope for help and to be transported out of the infected area; however, by the time they arrive at the evacuation center, it has either been evacuated or completely overrun by the Infected.
Here is a list of some of the evacuation centers:
Fairfield Municipal Park (Unconfirmed but assumed to be overrun) ― This may be CEDA's first outdoor evacuation center (other than Bienville Park). This site was created before CEDA began the panic of thinking the virus was airborne and enforce new security measures such as face masks and decontamination trailers.
Hewlitt Recreation Center (Overrun) ― The recreation center was probably similar to a community center where CEDA set up another evac site. This was perhaps one of the first evacuation centers to be overrun with Infected. Similar to school evac sites, this was probably used as temporary shelter for citizens to take refuge.
Brigham Junior High School (Overrun) ― A junior high school located in Fairfield, this was one of possibly several schools used as an evacuation center. This site was similar in the movie Resident Evil: Apocalypse where survivors made their way inside the junior high school.
Fairfield Civic Arena (Overrun) ― Fairfield's possible main evacuation center was the civic arena due to its large capacity capable of holding many citizens. CEDA probably focused more on this evacuation center due to the higher numbers of people and its location. However, due to its large number capability and the risk that CEDA wasn't able to screen everyone or didn't have time to screen everyone, infected people had made their way to the site and easily overran the evac site.
Borden High School (Overrun) ― A local high school in the City of Fairfield, this was possibly one of the remaining evacuation centers in the entire city (other than Mercy Hospital). With the city overrun with infected, survivors pulled out to the outer edges of the city making their way to the nearby town of Riverside possibly bringing the virus with them. This is similar to the 2010 film The Crazies where the U.S. Army sets up a screening and quarantine facility in the local high school before infected overrun the facility and the military is forced to pull back.
Mercy Hospital (Overrun) ― Designated Evacuation Center #008, it is another one of the main evacuation sites in Fairfield and possibly the initial site of original infected victim. Most citizens ended up here where doctors were still trying to discover and understand the virus while screening citizens, trying to separate the Infected from the uninfected. CEDA possibly used the hospital and its equipment and staff to help diagnose the virus; however, the hospital was overcome very quickly and CEDA probably pulled out via the News Chopper. Many in-game clues also suggest that Mercy Hospital might have been ground zero of the Infection.
Riverside First Church (Overrun) ― With Fairfield being overrun, the military took over the CEDA site and set up a command center in the nearby town of Riverside in hopes to keep the virus contained. Remaining evacuees headed to Riverside in hopes of rescue and were probably stuck waiting at the church until given the okay to enter the town. By then, the Infection had passed on from Fairfield to the outer districts and towns, causing the Infection to reach Riverside. The Army quickly pulled out, deserting any of the survivors in Riverside, which soon also became infected. One of the last remaining survivors of Riverside was probably the Church Guy who finally succumbed to the Infection.
Metro International Airport (Quarantined, bombed by the military and then overrun) ― Travelers from Fairfield may have gotten infected and brought the virus to the City of Newburg, causing the continuous spread of the virus. CEDA tried to quarantine the airport and keep the Infected away from the uninfected population of Newburg; however, once again, they failed and the military ordered an immediate bombing of the airport. This method was ineffective because by the time they bombed the airport and the city, the entire city had already became infected.
Daughtery Farm (Assumed that CEDA was in control of it, then taken over by the military and finally was overrun) ― One of the evacuation centers near Allegheny National Forest was this farm. CEDA told nearby civilians to head to the farmhouse to be rescued; however, since the farm was in the middle of nowhere and the lack of CEDA and military gear and equipment, this evacuation site was easily overrun. Apparently, the City of Newburg or Metro International Airport is somewhat near this forest as a CEDA "Quarantine" poster was in the shed safe room informing people that the airport was quarantined.
Atlanta (Unconfirmed but assumed to be overrun) ― One of the last standing evacuation center cities in the Northeast quadrant according to The Sacrifice, CEDA announced for civilians to make their way there. The military most likely aided in keeping the city secure and safe, but once again, as seen in The Hotel in Dead Center, CEDA failed yet again.
The Vannah Hotel (Evacuated and overrun) ― CEDA probably screened the civilians coming into the hotel, then sent them inside to be evacuated, making them wait long periods before they were evacuated. The situation quickly began to descend into chaos as people turned into Infected, causing civilians and CEDA to retreat to the nearest evac station in Liberty Mall.
Liberty Mall (Overrun) ―CEDA provided shelter in the mall while they screened people and evacuated them from the area. But since malls are so big and there were so many people, Infected quickly got inside and killed or infected everyone.
Rayford, Georgia (Overrun) ―In the setting for The Sacrifice and The Passing , CEDA may have had some involvement here as Infected CEDA workers can be seen as well as the captured Tank in the train car labeled "LIVE SPECIMEN" and "Property of the United States Army" on the door. In The Underground, some graffiti humorously says that CEDA has been supplying the town with toilet paper. It seems that Rayford preferred to survive the Infection on their own, as evidenced by the prescence of M60's, supply lockers, lack of CEDA equipment, and the Fallen Survivors. However, there are several buses, probably used for evacuation, that appeared to have either been abandoned, or crashed, as some of them block the streets. It can thus be assumed that when Rayford failed to contain the virus and the Infected began to overwhelm the armed citizens, the agency stepped in and began [unsuccessful] evacuation operations.
Rayford Port (Overrun) ―Forced to allow CEDA to intervene, they set up a command area near the port as it best serves as a defensive perimeter. Due to the constant power outages and necessity of power to allow for an evacuation, CEDA most likely brought in a few gas-powered generators. They were used as floodlights and three were mainly used for the purpose of dropping and raising the bridge. However, once they got the generators in place, it seems to have alerted the horde (similar in The Sacrifice) causing many Infected (and Tanks) to be drawn to the area; therefore, CEDA and any remaining survivors pulled out and headed to the evacuation center at Whispering Oaks Amusement Park.
Whispering Oaks Amusement Park (Evacuated, closed and overrun) ―Park staff probably worked to shelter and entertain the civilians to help them maintain a healthy state of mind (as suggested by CEDA). CEDA either had already set up shop or quickly decided to do so in an effort to evacuate civilians (as well as the Midnight Riders). To hold off Infected swarms, the evac was set up deep within the park near the entrance of The Peach Pit stadium, where the Midnight Riders were scheduled to perform. This evacuation site is actually marked off as "Closed"; therefore, the evacuation may have been successful and CEDA may have sent out a chopper to check for remaining survivors in case anyone was left behind.
Bienville Park (CEDA once was in control of it, then it was taken over by the military and was overrun) ―With evacuees quickly filling up the bus station, remaining refugees were asked and stuck waiting in the nearby park. People were slowly let into the bus station evac center by the CEDA trailer that the infection was able to catch up to the remaining survivors. With Infected individuals at their nearnby, the panicked civilians fled the area and rioted towards the bus station in an attempt to escape.
The Bus Station (CEDA once was in control of it, then it was taken over by the military and was overrun) ―It can be assumed that everything was fine until the Infection caught up to the evac station. With the Infected at their heels, the panicked civilians rioted in an attempt to get to freedom. Knowing that it would be impossible to take everyone and make sure the virus didn't spread, the military was forced to take action and shoot all civilians outside the gate.
Veterans Memorial Bridge (CEDA once was in control of it then it was taken over by the military, maybe evacuated Survivors and was overrun) ―Knowing that the situation was out of control, the military decided to evacuate anyone they could by quarantining an area between the uninfected and the Infected, only letting people through if it was confirmed they were not Infected or didn't help anyone escape. Inevitably, the attempts to quarantine the area were quickly failing. The bridge was to be destroyed to slow the spread of the Infection, as the Infected cannot swim (stated in graffiti and reinforced by boats being acceptable "safe" evacuation vehicles). Just before the bridge was to be destroyed, the Survivors were cleared to attempt to get across the bridge and escape via the last helicopter out of the area. (It should be noted that there is barely any CEDA equipment beyond the bus station to the bridge).
Throughout the Left 4 Dead series, several different types of evacuation vehicles were used to evac refugees from high-risk areas of Infection (or hot zones) to areas that are much more secure and Infection-free. CEDA was able to commandeer vehicles and resources in order to help benefit the evacuation. Larger vehicles such as buses and trucks were used by CEDA to evacuate people due to the large capacity they can hold and wanting to keep people together; however, these methods of transport were also the slowest and can spread easier, which gave the advantage to the Infected and allowed the Infection to spread quicker. Also, CEDA stated on the medical timetable chart (seen in The Vannah) that two CEDA EVWS must accompany all transport vehicles (see poster below); this was most likely a safety precaution implemented by CEDA to keep track of all refugees and watch for signs of sickness and the infected (which turned out to be very little of help as every locale is overrun). Below are some of the transports seen throughout both Left 4 Dead and Left 4 Dead 2.
mainly used to carry patients and medical supplies
used by the military to carry soldiers in and refugees out of areas
can carry large capacity of refugees, seen by original survivors in L4D1
can carry large capacity of refugees, seen by new survivors in L4D2
used to evacuate patients, medical and hospital staff, as well as CEDA from Mercy Hospital
used in Rayford to evac refugees and move a captured Tank specimen
seen at the beginning of Dead Center at The Vannah hotel, it abandons the survivors (most likely due to full capacity and the chopper had no more room for more people)
seen throughout L4D2, it is mainly used throughout Savannah and New Orleans to evacuate and screen people for signs of the infection
It's not apparent how much CEDA knows about the Infection, though it doesn't seem to be much. However, they definitely have done some research on it. They believed the Infection may be airborne (this assumption supported by a Doctor who states sometimes it is airborne, but not other times) and think the disease might come from livestock. Out of all the Special Infected, they appear to have the most knowledge about the Boomer. They have been able to manufacture jars of Boomer bile and there is a research poster about the Boomer in Dead Center which includes photographs of it (as seen in the picture). There is little or no mention of other Special infected by CEDA; however, in The Sacrifice DLC, it was revealed that CEDA had in fact captured a live Tank specimen from Rayford, Georgia. In The Hotel, there is a pie chart that may state the names of the Special Infected, but it might be too blurry.
"Give the infected a taste of their own medicine with this CEDA-developed gastrointestinal projectile. Any zombie you soak with this puke grenade will be swarmed by common infected."
―Left 4 Dead 2 item description Research done by CEDA on the Boomer
In Left 4 Dead 2, there is a new grenade item called a Bile bomb. It is a glass jar filled with Boomer bile which is manufactured by CEDA (since it is dropped by the CEDA Worker Infected). When thrown, the jar breaks, releasing the bile. Unlike regular boomer bile, it can attract infected even if it does not cover a person and can even cause Infected to attack other Infected soaked in it. Survivors are also not affected by it. These abilities may mean CEDA is able to modify the bile (however, this may strictly be for gameplay and may not reflect the abilities of CEDA).
CEDA most likely spent most of their time and efforts on researching the sickness in the general public since the majority of the population displays the most common symptoms of the Green Flu virus. Civilians that died due to the sickness or Infected that were shot by the military (to stop the spread of the disease) were zipped up in CEDA biohazard body bags and were transported and given to CEDA research areas/labs in an effort to gain more knowledge of the virus and possibly find a cure however, due to the severity of the sickness and the lack of time as well as constant mobility and moving, they weren't able to pursue much research into it. They created very loose base conclusions on this research stating that "Clean Hands Save Lives" can help prevent Infection when, in fact, the doctor at Millhaven contradicted this prevention method as he stated that sometimes the virus randomly mutates into an airborne strain. Then CEDA decided that the virus was more like a flu, due to the similarity to influenza and how it was an airborne sickness (which is why they started the use of facial masks); however, further research revealed that the Infection was much more similar to rabies, especially in the aggressive, rabid demeanor of the Infected; therefore, people would comment on or rule out that it was no ordinary flu (as seen in graffiti on walls). CEDA was wrong and could not find any definite answers based on the research of the Common Infected based on the time they had thus far.
It appears that CEDA captured a live Tank and did a number of surgeries on it; whether or not they discovered anything of importance or did any other sort of research on this Tank is unknown. This Tank was kept alive and put into a biohazard train car and was escorted by the military while passing through the town of Rayford, Georgia; however, the train derailed perhaps due to a quick-striking wave of Infected or an obstruction on the train tracks.
Also, during The Port, the players must fight several Tanks, one of whom is different from the others because it has shackles around its wrists and a small eagle, globe and anchor tattoo on its chest. The shackles suggest that this is another captured Tank specimen that managed to escape, and the eagle, globe and anchor tattoo strongly indicates that it might have been a member of the U.S. Marine Corps before turning. Whether this was just a coincidence or if it implies that the military were experimenting on their own is unknown.
Due to failure in containing the Infection and the virus becoming more of a public and national health hazard, CEDA was suspended and the U.S. military took over all CEDA operations. This presumably happened somewhere between the events of Dark Carnival (assumed day 22) and the events of The Parish (assumed day 24). Checkpoints and evacuation centers were taken over by the military who had authorization to use deadly force. Civilians were relieved when the military took over; however, the military used much more "aggressive" means of containing the Infection by fencing everyone up, separating groups, and finally shooting Infected civillians or potential carriers of the Infection. Also, CEDA-issued instructions on building a safe house stated that in accordance with CEDA Management Policies, no firearms or guns were permitted in safe rooms. However, when the military took over, they encouraged civillians to arm themselves. If you look closely at most of the military posters, they are from the USMC (United States Marine Corps), though some are only labeled "U.S. Military."
Throughout the Left 4 Dead series, CEDA has manufactured various posters with safety tips and [unsuccessful] methods of preventing infection as well as other forms of advertisments which indicated evacuation locations.
CEDA appears to be based on the real-life FEMA, which has particular resonance in New Orleans, especially in its advice to cover windows with plastic sheeting and duct tape. The name may also be a play on the CDC, an organization involved in preventing infectious disease. The CEDA name and logo also resemble Civil Defense the Cold War-era origination that preceded FEMA.
CEDA has their own duct tape as seen in many triage tents in Savannah. The tape is a bright yellow color and bears the CEDA logo and name repeatatively.
In Dead Center, the helicopter that is leaving the roof is similar to the one that evacuates the Survivors after the Bridge Finale in The Parish. This would suggest that CEDA was meant to organize civilians and rally them to certain evacuation points, where they would be taken by the military to strongpoints or viable evacuation sites. It may also suggest that CEDA didn't have the amount of equipment needed to evacuate a large amount of civilians, and needed military vehicles and helicopters before being superseded.
The remaining population is likely dissatisfied with CEDA's response to the epidemic. Graffiti through the campaigns say things such as "CEDA BLOWS" or "CEDA sucks."
In Rochelle 's official photo, several human CEDA workers are seen in hazmat suit in the background inspecting the area and taking samples.
Large Decontamination Trailers can be seen parked around The Streets, and one in The Parish. Ironically, text on the side of these trailers labels them as the "Disease Emergency Assessment Dispatch," or D.E.A.D.
Throughout, when examining the makeshift medical tents and posts, all of the fluid pouches alongside the beds are branded Cure Blood but have the word CONTAMINATED stamped over it. In addition, all of the pouches that were stamped have the words facing the opposite direction of the beds. It is possible that CEDA were either testing Infected blood on patients without their consent (or awareness) or labeling them as contaminated to avoid the pouches from being reused.
In Team Fortress 2, one of the random bot names is "CEDA".
When killing an infected CEDA scientist with a firearm the player can hear the suit un-pressurize as if being punctured for the first time. This has brought up controversy as to how they could have been infected even when wearing suits to protect them from seemingly all methods of infection. Thoughts of how it could be a developer oversight is met with the argument that they had to personally add the sound file themselves when creating the game entity and that it couldn't simply be a "mistake".
CEDA have been involved in responding to the Green Flu epidemic. They have created advertisements alerting the public about the disease, tried to evacuate citizens from highly infected areas, and even researched the disease. Once they realized how powerful and virulent the Infection was, CEDA agents isolated themselves from the public in hazmat suits and decided to provide the public with face masks while trying to evacuate the public. Large-scale evacuations were called and required CEDA to bring in several Disease Emergency Assessment Dispatch trailers to help process people faster. 
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