Fo2 US Chemical Corps

FEV Curling-13 development laboratory.

FEV Curling-13 is a viral agent tailored to reach maximum levels of lethality with minimal exposure levels required to achieve the result. Based on the original FEV-II recovered by the Enclave at Mariposa Military Base's ruins, it was being developed under the direction of Lt. Col. Dr. Charles Curling of the Chemical Corps since 2236, to provide the means for the Enclave's second holocaust. Trials would progress for several years, culminating with the thirteenth trial where the chemical weapon would be perfected for use on civilian populations.


The Enclave FEV Project was ultimately developed to rid the entire world of human-based mutants, regardless of the degree of mutation. Any person that wasn't inoculated from the virus would die several hours after contact. The Enclave's plan was to release the Curling-13 virus into the air and let the Earth's jet streams takes care of transmission; enough time will pass for the virus to reach every corner of the globe. Enclave President Dick Richardson does not take joy in exterminating all mutated humans (or non-mutated humans) but believes that this is the last, best hope for humanity and no price is too high to pay for the survival of the human race.[1] Before the virus was able to jettisoned into the air, the Chosen One destroyed Control station Enclave and the virus with it, mere hours before is was scheduled to be released.[2]


Unlike FEV-II, which required a severe overdose and low radiation count in the subject to work correctly, Curling-13 killed indiscriminately. Just a .0001% aerosol solution exposure was enough to kill Arroyo villagers in under one hour, as massive hemorrhaging and inflammations start, leading to a complete failure of the victim's organs within sixty minutes. Significant radiation-induced mutation may thus be beneficial - humans with a lower radiation count suffer a much worse fate. Pure Vault 13 dwellers exposed to the virus first suffered initial symptoms: a burning throat, heartburn, followed by a feeling of burning lungs, drowsiness, and loss of sight.[3] Within 60 minutes of exposure, they'd suffer subdermal hemorrhaging and convulsions, with the agony lasting 14.5 hours on average. No test subject survived the tests on Control station Enclave.[4]

Despite certain chemical supplies running low[5] the Enclave's manufacturing capacity was tremendous - within six weeks they could produce 250,000 gallons of the virus and unleash it on the world just by spraying it into the jetstreams converging at the Oil Rig - the winds would then carry the virus worldwide, achieving global saturation in two weeks.[4] Only Humans and human-based mutants would be eradicated, however - FEV was engineered to bond only with human glycoproteins, leaving other animals and plant life alive. The virus, if released as planned, would have eventually exhausted its potential hosts and essentially self-destruct.[6][7]

Well before Dr. Brian Virgil developed his FEV cure, FEV Curling-13 was the first known FEV strain to have a medical treatment developed in the form of an inoculation that granted total immunity from its effects.[8] In fact, the Enclave was on the verge of releasing the virus: the necessary amounts were ready for release and the only problem was distributing the inoculation supplies to Enclave members, so that they would be immune to the virus in the event of exposure.[9]


Main article: Modified FEV

While FEV Curling-13 was never released, the progress made in turning FEV into a lethal chemical weapon would later be attempted again by the Enclave on the East Coast. A modified strain of the Forced Evolutionary Virus developed by John Henry Eden, based on the earlier FEV Curling-13 strain, only now it was designed to be placed into the Project Purity water purification system.[10] According to President Eden it will eradicate super mutants, ghouls, and all other "unclean" citizens, namely anyone who had been born in the Wastelands and exposed to radiation and other mutational effects from birth.[11] The only people who would survive the infection are dangerous radiation level free humans and humans who were born in the Vaults.[12] This strain of FEV is decidedly less lethal than Curling-13 as it requires ingestion of it through infected water supplies and does not kill immediately.


    The Chosen One: "{239}{}{Cleanse the mutants? That sounds a bit drastic. How are you going to do that?}"
    Dick Richardson: "{240}{prs41}{We found a research facility in operational shape about 70 years ago. A former military base that had been used to research a special virus.}"
    The Chosen One: {243}{}{Altered the virus? Why?}"
    The Chosen One: "{245}{}{That's insane.}"
    Dick Richardson: "{246}{prs43a}{No, no. That's humanity's last, best, hope. That's what we've been working towards all these years.}"
    The Chosen One: "{247}{}{Great, so you have all this poison and no way to spread it around.}"
    Dick Richardson: "{256}{prs47}{Oh, but that's one of the advantages of the F.E.V. virus. We can release it right here and the jetstream will carry it worldwide. It'll have plenty of time to cleanse every nook and cranny of the globe.}"
    The Chosen One: "{257}{}{OK. Then why did you have to kidnap my villagers and the people from Vault 13?}"
    The Chosen One: "{259}{}{You're not testing the inoculation on my people?}"
    Dick Richardson: "{260}{prs48a}{It's hardly necessary. I'm sure we could and it would work, but there's no reason to do so.}"
    "{261}{}{Did it ever occur to you that what you're doing is wrong?}"
    Dick Richardson: "{262}{prs49}{Never. Part of the president's job is to make the tough decisions. A lot of near-humans will sacrifice their lives for the return of humanity. Humans will prevail.}"
    The Chosen One: "{264}{}{Just because everyone out there doesn't have an exact copy of your DNA that doesn't give you a license to exterminate them.}"
    Dick Richardson: "{267}{prs51}{Oh, I don't relish this decision. If there was another way- but there isn't. No price is too high for the survival of the human race. If you were human, you'd feel the same way.}"
  3. Enclave citizen: "{123}{}{Where's my breather mask?}"
    "{124}{}{Something smells funny.}"
    "{125}{}{I don't feel too good.}"
    "{126}{}{The air burns my throat.}"
    "{127}{}{Man, do I have some nasty heartburn.}"
    "{128}{}{My lungs are on fire.}"
    "{129}{}{I think I need a breathe of fresh air.}"
    "{130}{}{Is it getting darker in here?}"
    "{131}{}{So sleepy, must rest.}"
    "132}{}{I think I'll just sit down for a bit.}"
  4. 4.0 4.1 The Project
  6. The Chosen One: "{209}{}{I still don't understand how that's *perfect.*}"
    Charles Curling: "{211}{}{The F.E.V. toxin will only attack to humans, leaving everything else alive, better still, within a month all the mutants will be dead and the F.E.V. toxin will die out as soon as it runs out of hosts. }"
  7. The Chosen One: "{203}{}{Great for you, but how does that have anything to do with eradicating everyone?} "
    Charles Curling:
    "{204}{}{Oh, yes, well, I was getting to that….The F.E.V. virus bond is species specific, it will only bond with human glyco-proteins. It only took a few years to tweak the F.E.V. virus to make it more lethal than it all ready was. The result was just what the doctor ordered, perfect in every way. }"
  8. The Chosen One: "{237}{}{What about my people? Or me? Or you, for that matter?}"
    Charles Curling: "{238}{}{I can release the antidote into the air-system for all the cells. The detention level is served by a separate air system from the rest of the Enclave. Everyone will think that I'm just running another test. You, I can inoculate directly, here and now. (he reaches for you with a syringe)}"
  9. Dick Richardson: "{273}{prs54}{You could try, I suppose, but soon the staff of the Enclave and Navarro will be inoculated.}"
    Chosen One: "{274}{}{They aren't already?}"
    Dick Richardson: "{275}{prs55}{We just have to distribute the supplies. A matter of hours. Besides, the Enclave is a sealed unit. No air or contaminants get in or get out.}"
  10. The Lone Wanderer: "Where did this plan of yours come from?"
    John Henry Eden: "A great many years ago, the remnants of the government had a similar idea. I can only assume the plan failed, as I never heard word of its success. But the plan itself was sound. I've made a few modifications, and with your help, I do believe it can work. There's a bright future ahead of us, my young friend."
    (John Henry Eden's dialogue)
  11. The Lone Wanderer: "Say whatever it is you have to say."
    John Henry Eden: "Our land is ravaged by mutation. The war was so many years ago, and yet we still suffer from its effects. We cannot move forward until humanity can gain a solid foothold in the world. To do so, we must rid ourselves of the mutations that have plagued us for so long. These "Super Mutants", Ghouls, hideous creatures... I believe your father's work can do that in a way unlike any other."
    (John Henry Eden's dialogue)
  12. The Lone Wanderer: "Won't this kill pretty much everyone in the Wasteland?"
    John Henry Eden: "Anyone or anything that has been affected by mutation will be eliminated. You will likely be immune, thanks to your upbringing in the vault. Likewise, the good people of the Enclave will be unaffected as well. I understand that you may have become sympathetic to certain individuals in your travels. Individuals this will eliminate. Please recognize that the fate of our entire country rests on this plan. Sacrifices must be made for the greater good."
    (John Henry Eden's dialogue)