Talk:Forced Evolutionary Virus

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How about just having this page redirect to the FEV section of Mutant? Good idea? Dan 10:09, 21 Feb 2005 (GMT)

You can't redirect to sections. And mutant is not the place to describe the history of FEV etc, which should be edited out of that article. Ausir 12:39, 21 Feb 2005 (GMT)


Some of the information about FEV origins are not accurate on this page. In short, Pan-immunity Virus Project was developed in order to fight an unspecified Plague that was hitting the US at the time (and which, by the way, was the reason for nation-wide quarantine protocols going into effect at around 2053). It was suspected the Plague was effectively a biological weapon, but nothing definite on that.

Furthermore, PVP was renamed to FEV on 21. March 2075, and it was done by the researchers themselves, not the military. The military was sent in to observe these experiments ("in the interest of national security") much later - on the 3rd of January, 2076.

Testing on chimpanzees (batch 11-111) was conducted on October 4th, 2076. It is not until early January of 2077 (7th, to be exact) when the FEV research is forcibly moved to Mariposa Military Base, where secret human testing begins. The military force stationed there is oblivious to this, though. In October of the same year they find out, though, and stage a revolt (killing chief researcher Anderson in the process). 20. of October, Cpt. Maxson (later to be seen as Brotherhood of Steel leader) declares his (and his team's) full desertion from the military. This all still happened before the bombs fell. :)

I won't do the editing myself, so please use Your genuine Wiki editing skills to do it right (I can't be held responsible ;P).

Information source: Fallout Bible update 0, Timeline section (with further updates; all written down by Chris Avellone)

I think I see something inaccurate in the articles description of why the Mariposa strain causes sterility. IIRC, the reason is not because it changes the structure of genes, it's because it adds 16 more chromosomes to sperm and egg cells to give them the 32 that every other type of cell in the human body is supposed to have, which makes fertilization of the egg impossible. 00:55, August 28, 2010 (UTC)

Then by all means, correct it :) --Kris mailbox 01:07, August 28, 2010 (UTC)
I've never heard of FEV adding chromosomes. It's always been altering the structure of genes. Nitty Tok. 01:09, August 28, 2010 (UTC)

"Super" super mutants?

I believe it should be explained what happened to the successfully evolved test subjects -claimed to be superior to humans in every way- in a comprehensible way, or just explained if for nothing else. -kenx

Some of the ones that didn't lose any of their intellect (and could have actually gained some) appear in FO1, FO2, and FOT: e.g. Lieutenant, Marcus and Toccamatta. Ausir 17:27, 10 April 2009 (UTC)

Germantown Police HQ

If you have a stealthy character, you should enter the German Town Police HQ from the top floor front entrance. Once in, go stealth and break for the room for the immediate left, there should be two Super Mutants talking. You can easily hide behind the counter infront of them and listen for some nice dialogue. Realek 01:14, 10 January 2009 (UTC)

Soldiers knew about FEV research?

Would the US Army soldiers have known about the FEV research?

  • Probably not, or at least only in general terms. The military officers in charge of the Mariposa Military Base (Colonel Robert Spindel and Captain Roger Maxson, the latter eventually becoming the founder of the Brotherhood of Steel), as well as the soldiers under them, were completely unaware of the specifics of FEV Research while it was going on. --Webgiant 17:10, April 28, 2010 (UTC)
    • In addition, in Fallout 3, the Overseer and his guards infect Vault 87's residents with the FEV virus, but are doing it under orders from Vault-Tec and have not been made aware of the specifics of FEV research. The first time they find out what the FEV virus is supposed to do is while they themselves are being forcibly mutated by the new super mutants they helped create. --Webgiant 17:10, April 28, 2010 (UTC)

Too speculative?

Would it be too speculative to mention that east coast testing of the F.E.V. might have had differnt results since the poplutaion had had an unique exposure to a radioactive product aka Nuka-Cola Quantum that west coast test subjects had not? (Rifts Juicer 05:23, 13 April 2009 (UTC))

I think Nuka Cola Quantum only shipped to the public immediately before the bombs dropped - whilst there were plenty of testing done with the local population, I dont think this would have made much difference given the relatively low volume of subjects exposed. Good idea though. -- 03:28, October 2, 2009 (UTC)

Products of FEV

Is there any list that has all the creatures that are results of the FEV? I know Super Mutants, Centaurs and some Deathclaws were created by or at least were effected greatly by it. And are there any similarities between creatures that have been effected by FEV? --Moltenfungus 01:45, 26 June 2009 (UTC)

  • There's no list of such creatures (yet), but Super Mutants, Centaurs, Floaters, and Wanamingos wouldn't exist without them. Occasionally a Ghoul is created with FEV, like Harold and Talius. Of the creatures created by the FEV, where their current shape and abilities were entirely dictated by the FEV, immortality and sterility seem to be the only similarities. The Talking Deathclaws, which were given their intelligence and speech by the FEV, but did not have their entire genome redeveloped by the FEV, appear to grow older and retain the ability to reproduce. --Webgiant 18:18, April 28, 2010 (UTC)
    • It was originally intended for Fallout (the original game) to have an intelligent species of bipedal raccoons called the S'Lanter, with a section of the Fallout wasteland called the "Burrows". In the Mariposa Military Base, a holodisk was left behind, which the Vault Dweller could still find, containing FEV research information, including "Two pairs [of FEV-mutated raccoons] were unaccounted for." Among other deviations from the general style of the Fallout genre, the raccoons would have been a creature whose genome, shape, and abilities were dictated by the FEV, but who retained mortality and the ability to reproduce. --Webgiant 18:18, April 28, 2010 (UTC)

Total Sterility?

In Fallout 2 you can get Marcus some action at the Cat's Paw. Text will appear over his head stating "I hope she doesn't get pregnant..". You can ask Marcus about the claim and he figures you don't know about the birds and the bees. You can tell him you thought all Super Mutants were sterile and he will say "No, no. Who told you that? Well, it takes a few years to get the juices flowing..." So apparently, they are not sterile. At least, according to Marcus.

They are sterile. Marcus' line was a joke. Personal_Sig_Image.gif Tagaziel (call!) 21:50, April 27, 2010 (UTC)
Not all creatures are sterilized by the FEV virus. The Enclave created some intelligent talking Deathclaws by infecting regular Deathclaws with the FEV virus. These talking Deathclaws were not made sterile by their exposure to the FEV virus. --Webgiant 07:14, April 28, 2010 (UTC)
    • Of course, this could be the result of intelligence and speech being a potential already existing within Deathclaws, as there are "Hairy Deathclaws" in "Fallout: Tactics" which are intelligent and capable of speech without having been exposed to the FEV virus. --Webgiant 07:14, April 28, 2010 (UTC)
    • So can we assume The FEV affects different species differently? I see now Marcus' line was meant to be a joke, though I suspect it was added intentionally then written off as a joke when it went against what we already knew about the FEV and Super Mutants. The Deathclaws in Vault 13 seem to be breeding just fine despite being runaway test subjects to Enclave experiments. Though now that I think about it. Vault-tec and Enclave FEV viruses are different... KaisarDragon 16:08, April 28, 2010 (UTC)


I was just thinking, if FEV is a virus, surely it'd be contagious, that's the main callsign of a virus unless I'm much mistaken. Okay so it was man-made and there's a chance they didn't want it to spread, but still, viruses are viral. ThePog 15:39, May 8, 2010 (UTC)

It's not contagious. Personal_Sig_Image.gif Tagaziel (call!) 16:59, May 8, 2010 (UTC)
Naturally, viruses need some way to go from one organism to another in order to survive. Viruses can't reproduce on their own, they need to use living cells for that. But FEV isn't natural. It doesn't do what viruses are supposed to do. Instead of using cells to reproduce, it rearranges and modifies the genes inside of them. Of course, a body that now has a perfect immune system is not a safe place for a virus to be. The Curling and Eden strains could maybe be transmitted if you ingested tissue from their victims, but why would you do that? 00:41, August 28, 2010 (UTC)


FEV is actually a misnomer, for more than one reason. The first reason is that evolution does not actually make things bigger and stronger, that is a common misconception, what evolution actually is the change of allelle (I didn't spell that right) frequencies in a population. Another reason is that evolution requires reproduction with variation, and since FEV sterilizes the host, this would make evolution impossible.

"evolution does not actually make things bigger and stronger"
Source 1 and Source 2. Your logic is invalid. Nitty Tok. 02:33, October 13, 2010 (UTC)
Nitty really your going to disprove an anon with Pokemon? Now your going to make us all look silly :P ---bleep196- 02:41, October 13, 2010 (UTC)

it doesnt even work that way in pokemon, what happens with pokemon is that environmental conditions cause a pokemons body to undergo metamorphosis into a more suitable form. That is why reproduction is valid throughtout most pocket monsters lifespans (if you want to know more about pokemon evolution go to my talk page) similiarly the orced evolutionary virus forces the body to undergo adaptions to survive better, in humans in maximizes our current physical potential with unfortunate side effects. It is not TRUE evolution that requires millions o years to get anywere, it is evolution of the being being effected into a better being. I cant say i completely understand real evolution or forced evolution . . . i think the slot in my brain that understands that kind of stuff was taken up by pokemon in 1998. ralok 03:27, October 13, 2010 (UTC)

I am the same anon who first posted this topic, I just don't have an account here, I just would like to point out that it is not just not true evolution, it really isn't evolution at all, although I have never heard of forced evolution, and I am not sure there is such a thing. Also evolution does not make a species better, it just makes it more fit to pass on it's genes. The difference is that it could be detrimental to the specific organism, but it could help it's relatives survive and pass on the same genes it has, for instance I doubt that a mutation making an organism keel over and die after half of it's normal lifespan would make that organism better, but if after it died it's children could eat it and not have to use food to keep it alive after it's ability to reproduce is gone, but FEV would do the complete opposite, a FEV mutated human is not only sterile, it is actively hostile to humans which can reproduce, making them less able to pass on their genes, although this could be seen as an increase in selection pressure forcing every other species to adapt in order to survive, but I do not think this is what the people who named it had in mind.

IT is not the FEV that makes the mutant hostile to humanity. NOT AT ALL. ralok 20:53, October 24, 2010 (UTC)

fev ruined VAULT 87 how do you think its good!

Virus details?

I know much of the science in Fallout is not supposed to make sense in the first place but from a scientific standpoint, how the heck is FEV supposed to work? I know it's explained away by modifying the DNA into a quad-helix structure but that doesn't explain some things, like radiation immunity (radiation can damage DNA, true; but that has absolutely nothing to do with radiation sickness) or resistance to biological weapons: I'm not a scientist but viruses used as biological weapons behave like every virus in that they screw around with the target cell's protein synthesis so that the cell's ribosome will start producing new viruses instead of what it's supposed to produce. However, this is achieved by manipulating the RNA (dunno which, probably mRNA), not the DNA. The DNA doesn't even take place in the process directly!--Amitakartok 18:30, January 2, 2011 (UTC)

The DNA may very well be involved. There are different types of viruses. Some incorporate their DNA into the host cell's DNA and this way sabotage the transcription process (RNA synthesis, which is done by reading the DNA base sequences). Then, the new abnormal mRNAs can attach to ribosomes and make them synthesize whatever proteins they want. And with those proteins you can build and modify the organism. --TheBearPaw 12:32, January 3, 2011 (UTC)

Pre-War Super Mutants

Because FEV IS A Pre War Creation Is It Possible For There To Be A Pre War Super Mutant? --Ullyses = Epic 09:17, August 13, 2011 (UTC)

Because the FEV tests were done already before Great War there had to be supermutants like those in Vault 87's lab (those already dead in few chambers). Tests were also done in Mariposa on "volunteers", but result creatures could be killed. But Master created "normal" supermutants after many people mutated into something else. Krypciak970

Mission Cloacina

This proves that they were attempting to use FEV on other bio-weapons at the same time.--Ant2242 (talk)

FEV turning Rats into entirely different creatures

I recently came across an F2 strategy guide in PDF form, it's been an interesting read, and I've been going over various sections where there were inaccuracies and adding information to those that might have needed it. But this one was just so astounding that it took the cake. (And I thought The Big Head already did that) So, according to Melchior's page, he turns *rats* into things like, going off the potential spawns he has in F2, Deathclaws, Floaters, Fire Geckos, and Mole Rats. Now, I know F2's game guide has a lot of inaccuracies in of itself, such as it calling the Vault-Tec Organ Extractor the Vault-Tek Organ Extractor, but would this be anything of legitimate note, or something that can be tossed away as F2 nonsense? Ss2077 (talk) 06:02, 1 August 2019 (UTC)

Fairly sure it can be chalked up to weirdness on part of the game. Melchior is a conjurer of cheap magic tricks, and anything he does is... Well, inexplicable. So just weirdness. It's also possible the strategy guide is based on an early build, where he did actually spawn varieties of rats, until the developers realized there's no way that's going to be a challenge in the endgame. Tagaziel (talk) 09:26, 1 August 2019 (UTC)