Talk:Green Flu

Two Things
One: Now that the game is out, and we know that the church guy was, or at least claims to have been, bitten, we can determine that the infected do in fact bite. This would mean that infection is passed through bodily fluids, much like the Rage virus of 28 Days Later. Two: Can we safely assume that the green stuff that Bill rubs on himself is Boomer bile? It looks pretty much just like it. --HarrisonH 07:43, 29 November 2008 (UTC)

That might explain why that horde of infected attacks them suddenly.I think the infected only bite those who are not immune or are dead.(Bill can be heard saying "If I go down,don't let those bastards eat me.")--76.208.38.216 18:57, 9 January 2009 (UTC)

''One: I disagree w/the assumption we can take Church Guy at his word. We cannot.   Conclusion: The church guy's behavior is insane and erratic and undependable, and his eyewitness testimony to his own experiences are circumspect in that they don't measure up to observation. Point of comparison: The sheer absence of young and domesticated animals reveals more in what's not said, than the church guy's words reveal in what is said. Where did all the kids, dogs, and cats go? There's not even corpses of them anywhere. Discovering that would tell us more about how this disease behaves and perhaps even how it is contracted. ''
 *  A) He may have been bitten during the attack, but the bite is not definitively what caused the infection. He may also be lying about being bitten, or misremembering. He's not in his right mind when we encounter him.
 *  B) IF this is a genetically modified strain of rabies, the fact rabies is transmitted via saliva does not necessarily mean that's how this Infection must be transmitted. 
 *  C) There are no observations that indicate the Infected eat at all. Seeking shelter, water, food, or a survival instinct of any kind are absent in their behavior. We never see them eat, much less bite the survivors, or one another. 

''Two: The Boomer Bile may explain how some observations would lend credence to this being air-born and other observations seeming to contradict that. What if this Infection were air-born but only for short periods? What if the only way to contract it would be via Boomer Bile? Or perhaps to a lesser extent, when a Smoker detonates? Again, our Survivors are immune for currently unknown reasons (maybe they'd recently had their rabies shots?), but if every time a Boomer or Smoker explodes, any non Infected who inhale the air born bile would contract the disease. Said Boomer Bile might quickly lose its effectiveness after a short time exposure to the open air and the elements. Some could have come in contact with the Infected and not acquire the disease, unless a Boomer was involved. This would also explain perhaps where the children & domestic animals went. If prior to puberty, a human host body can only mutate into a Boomer, but some adults (or perhaps all eventually) can mutate into the other Special Infecteds, that would cause the disease to spread much quicker (within two weeks easy) especially since most parents wouldn't want to leave their child's side even after s/he began to show symptoms. The only thing I see that ruins this theory is the lack of reaction to all the children disappearing: no mention of it in the graffiti and no discussion of it among our Survivors. Perhaps they don't know, but one would imagine if all the children and small animals of the city exploded, there'd be some mention of it. ''

''Of course, all this is mere speculation, but based more on observation than the presumption that biting is at all involved. We never see the Infected bite anyone.'' - ZachsMind 22:47, 19 March 2009 (UTC)


 * As aforementioned, Bill states not to "let these bastards eat me," and occaisionally, after being incapacitated and revived, Zoey will say, "I have tooth marks on me"

Waterga74 23:11, 20 March 2009 (UTC)
 * You certainly have some interesting theories there, mister. I, myself, think that the Infection is spread primarily through oral contact, saliva in specific, as it is a strain of hydrophobia.  Also, as Waterga74 said, they talk about being eaten and bitten.  The lack of oral contact is probably more to do with game mechanics than the actual nature of the Infection, as is the distinct lack of children—which I will touch on in a moment.


 * How do you think you'd work in the biting into the gameplay of Left 4 Dead? Would a zombie or two or three or more hold you down and try to bite you, and you'd have to press buttons really fast to get away (like in Resident Evil)?  Would they just sort of casually nip at you while you're moving?  What's the point of animating something you're probably not even going to notice, anyway?  It's probably much easier to have them slash and smack and whatnot.  Also, the zombies probably have to eat, maybe they eat their victims, but showing them eating when they're supposed to mercilessly barrel at you.  Left 4 Dead isn't much for storytelling in front of your eyes, it's more of a story you have to read in between the lines to figure out, like looking at the graffiti.  I think that's what helps to make Valve's games so...fascinating.  I mean, look at the Half-Life series, and think about it.


 * Speaking of graffiti, have you seen the message a certain Will wrote? "TO HELEN LANE, DAD AND ME LOVE YOU AND WE ARE ALRITE - Will"  It looks a lot like it was written by a child, doesn't it?  I think the children are out there, but you don't see them in the game because that's basically a taboo in video games, it seems.  You can't kill children.


 * I do like your ideas about how the Boomers and Smokers tie into it, though. Very well thought out.  You most definitely bring some intriguing aspects onto the table. - §tigma-231  ¤ ৳ here's a  hole  in my neighbourhood [ talk  ][ cont ] 00:38, 21 March 2009 (UTC)

Cows
It has been suggested here that cows may be the cause of the infection. Two reasons: What are your thoughts? --HarrisonH 00:34, 2 December 2008 (UTC)
 * 1) In Blood Harvest, there are piles of dead cows. Their bodies seem to look odd, compared to our cows. Also, why would they be in piles?
 * 2) In the tunnel thing at the beginning of the finale of Dead Air, the signs say that you must contact security if you have been in contact with any livestock in the past 48 hours.

I think that the virus originated in cows, then thousands across the globe consumed the meat, only to mutate into the infected. Perhaps the pile of cows bodies was the armies attempt to kill off the virus in bovines, not realising it could spread through bite aswell? The DJ 14:54, 28 February 2009 (UTC)

Quick FYI
According to the game's strategy guide,people been reported being sprayed with infected blood during combat and did not turn into zombies or show any signs of infection.It also says no one knows why the infection appeared,but it says that the zombies are not rising from graves.It also says that there is a large amount of false rumors about the infected and that CEDA is partially responsible for their circulation,but it's mostly the public spreading them.--76.208.58.137 23:58, 2 December 2008 (UTC)

''It's plausible that the writers of the game do not themselves know for certain what the actual answer is, but left enough clues to suggest multiple possibilities, so fans could debate over it indefinitely. Hopefully though they made it a puzzle of sorts that can be sorted out with the evidence, and that there is an actual answer. Otherwise, debating over it would be futile, thus taking the fun out of such debate. However, as there is no evidence of aliens throughout the game, we can probably rule that one out. The fact the military actively efforts to save our Survivors at the end indicates they did not wish to leave them for dead. However, that alone doesn't fully remove "Government Conspiracy" from the table. It does indicate its unlikely. The gov't could have just as easily not rescued our foursome and just nuked PA from orbit.'' - ZachsMind 22:59, 19 March 2009 (UTC)

The Infection
My theory for the infection is that it is directly related to cows and fast food. I think the cows were given something to increase production or something which in turn were sent to restuarants. Eaten directly by future boomers and common(did not eat as much). The virus creating special infected mutates from what the host has in their body(tank-perhaps steriods)(hunter-drugs)(boomer-ate hamburgers a lot, direct contact with the source of the infection)(smookers-chemicals in cigerates and cigars.) This is my second comment so I don't know if I did something wrong our what. sidenote-cows farmhouse finale thing or some other level(dont have game) are dead in piles and in dead air a poster says to contact security if u have been in contact with livestock in the past 48 hours. i dont firmly believe this but it sounds kind of logical. no theory on witch yet (please leave comments on this page) XboxBoxLiveGuy321 23:51, 12 December 2008 (UTC)

I laughed at the hunter's explanation. drugs? what? =P the boomer coming first makes sense, since it was the first special infected developed.

actually, I understood that the special infected were just mutations. for example, a boomer may have resulted as the virus affected the gastrointestinal system drastically.

All the infected have a special role against the survivors, aside from teh witch.. The virus may have just mutated into these to make sure that the remaining survivors were infected or at least killed, to protect its own life. Waterga74 22:59, 28 February 2009 (UTC)

Mercy Hospital?
I noticed this on a recent playthrough; the IV bags found near beds at Mercy Hospital all have "CONTAMINATED" stamped in big red letters across their front. While I am unsure of hospital procedure (maybe they stamp it as such as soon as they tap it, since it can't be used on a different patient), it seems suspicious that everybody in that ICU was getting fluid marked as contaminated. Raptor22 04:08, 31 December 2008 (UTC)

''This behavior can easily be explained as a variant on the "Typhoid Mary" scenario. The hospital is overrun and there are many doctors and nurses doing everything they can in a crisis. One or more medical personnel notice a nearby blood bank is later reported to be overrun by Infected. Naturally they would assume that blood from said bank is also Infected, or at the very least compromised, and so they would mark that to separate it from the blood they still perceive to be good. Meanwhile, another one or more medical personnel, realizing they are rapidly running out of blood, would notice the "contaminated blood" and demand to know why its been marked thus, probably because there is a protocol to follow which due to time constraints the first group of medical personnel would have overlooked. The second group of medical personnel, ignorant or wary of the evidence the first group has regarding why such blood is presumably contaminated, would start using it anyway. This second group of medical personnel would be our "Typhoid Mary" group. They would perhaps be spreading the contagion, but refuse to believe any evidence contrary to their opinion. Point of fact, two weeks after contamination, there's still no evidence to suggest that blood is how the disease is transmitted. The second group may have been correct in saying the blood was fine, but they all died in a futile effort to save their patients anyway. Do remember there's a point in the hospital where we see an area cordoned off with yellow police tape. It's possible in that part of Mercy Hospital we might find the remains of "Patient Zero." '' - ZachsMind 23:32, 19 March 2009 (UTC)

iv bags
i think that during the infection and realising that some people were infected meant that some of the blood people have donated had been infected and there were trying to keep the infected blood out of the system.I assume as soon as doctor realised that a blood pack had been infected blood in it they stamped the contaimated stamp on it to stop the same person blood being used on someone elses but due to the chaos and panic of try to figure out which blood packs they could still use they ended up.Or someone was testing the CONTAMINATED blood in the hospital and that it went wrong and overwelmed the hospital

--Spygon 09:44, 31 December 2008 (UTC)


 * Could have spread through livestock then infected humans which then spread through biting, blood, and saliva. 69.12.204.67 10:00, 31 December 2008 (UTC)

the date
maybe this is not relevant for the infection but i read on the walls of many "safe rooms" R.I.P.s with the date on october-13-2009. maybe the infection started this day, on october 13.

also i read that the infection takes 5 min to 4 days to change you.

Okay, I realize that this was made a while ago, and this person didnt sign... but the blog on the l4d website says that the developing staff died in november. Maybe this has something to do with those deaths.. Waterga74 01:57, 18 March 2009 (UTC)

Immunity Trivia
I think there's a slight misunderstanding so far as speculation goes regarding the immunity of the survivors. All viruses, even those which are extremely common, are going to have people who are immune to them. Doctors are still actively researching why this is the case as they feel people who are immune may give us some idea as to how to get rid of such illnesses. But as it is, there are rare cases of people who are immune to Ebola hemorrhagic fever, AIDS, influenza, and so on. Something like this, that hits pandemic levels extremely quickly and changes people so drastically, would just stand to exemplify those with immunities.

That being said, the fact that the survivors are immune to it does not imply that it is a germ warfare agent, nor that a cure can be made any moreso than we can cure AIDS or the flu. (digiwombat | Not currently signed up) 76.170.233.156 22:06, 17 February 2009 (UTC)

That guy's smart. =O

But he's right. Viruses are just incredibly small organisms, smaller than germs. They alter the DNA of cells to produce more of the virus, which spread farther. This applies to all viruses. Some immune systems can, however, defend against them efficiently.

Waterga74 22:54, 28 February 2009 (UTC)

''I'm working on a theory that one possible reason why Bill, Zoe, Louis & Francis are immune is because perhaps they have each relatively recently had standard rabies shots. We are led to believe that many people successfully took the route this foursome has. In fact, perhaps one or more of them helped orchestrate this string of safehouses and are now the last ones to run the gauntlet to safety. It's plausible that immunity can come from some small recent change to how rabies shots are done, and any adults in recent years who have had rabies shots would be immune. There may also be a number of immune people who didn't make it because they weren't capable of escaping due to lack of gun knowledge for example. This would not apply to childrens' rabies shots, which might help to explain why all the children obviously died off first. This theory however is dependent on yet another theory that the Infection is somehow artificially or naturally related to previous strains of the rabies (aka 'hydrophobia') virus. If it's not, then regarding immunity, I'm back at square one.'' - ZachsMind 23:58, 19 March 2009 (UTC)

Pathogens: Comparing fact to fiction
''One point that I have not noticed anyone else make is that this is no ordinary pathogen. Viruses like AIDS and rabies and ebola damage tissue and even affect on a rudimentary level some behavior patterns among the infected. Particularly rabies with the latter, and ebola with the former. AIDS only seems to attack the immune system of its host, making the host more susceptible to other pathogens. In other words, AIDS appears to specifically target its host not to kill it, but to allow the host to be killed. This is counter intuitive to a survival instinct of more advanced living things. Viruses that we know about tend to purposefully endanger the future of the host, therefore limiting its own future as well. There's no survival instinct. However, the host him or herself is still cognizant the entire time up until death and actively in most cases persuing avenues of departure from its own demise.''

''This Infection removes from its host the will to live, and the will to allow anything else live. It appears systematically designed to decimate the human race. This Infection isn't just targetting the immune system or the digestive system or causing discomfort that leads to erratic behavior. This Infection affects the very nervous system of the hosts, turning them into agents for its own demise and that of its target. The thought of it is actually rather fascinating. ...well if it weren't so creepy it'd be fascinating.'' - ZachsMind 23:47, 19 March 2009 (UTC)


 * Well, heck, he's got us screwed. Waterga74 23:08, 20 March 2009 (UTC)

Special Infected
I believe that the infeced have changed more along the way, or the virus is still taking its course. At the begining of the game, Bill says that the infected are "changing", when Zoey and Bill see the Witch, they had no clue what she was...because they had never encountered her before. Now after two weeks, they surely must have seen a Witch at least once. This leaves two possible conclusions:

--A: All 4 of the survivors have been living under a rock.

--B: The infected are changing and/or adapting.

Once the game startes, they have established nick names for the infected from what they have seen, and how they act. A scarey thing about this is, after two weeks this is what the infected have adapted to, after two MORE weeks, there will be more infected that have converted, and possibly new types of infected. Imagine, all of the normal and common infected are now all special infected, no "plain" zombies...The world of L4D would end quickly. It appears that for the infected to become "special infected" it takes time, such as first meeting them after two weeks (which would mean, it took the original zombies 2 weeks to change to this), which would mean, the special infected that they are fighting now, were the first to fall to the virus. However, time to become an infected could vary between others, such as how some fall to the virus in seconds, some in days while others are immune. Example, the "Church Guy" became infected an hour after he was first bit, therefore, it took him a short while to become a special infected. While others, who become zombies days after they were first bit, may become special infected days after they become a zombie. --User:Monobrow1