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Modified FEV

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Icon disambig.svg
For the modified FEV strain in Fallout 2, see FEV Curling-13.
Modified FEV
Modified FEV.png
Icon fev vial.png
QuestsThe American Dream
Take it Back!
Base ID0003bd33

Modified FEV is a quest item in Fallout 3.

Characteristics[edit | edit source]

This vial contains a modified strain of the Forced Evolutionary Virus developed by John Henry Eden, based on the earlier FEV Curling-13 strain used by the Enclave in 2241, only now it was designed to be placed into a water purification system, it is received after dialogue with President John Henry Eden.[1]

According to President Eden it will wipe out 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. The only people who would survive the infection are dangerous radiation level free humans and humans who were born in the Vaults.

In the add-on Broken Steel, if the player had chosen to contaminate the purifier with the modified FEV, the medical facility of every city in the Capital Wasteland (except Tenpenny Tower) is filled with new patients dying from FEV infection. The new patients hold their stomachs and repeat dialogue along the lines of, "it burns on the inside." When the player speaks with the doctor at any given town, they state that the condition is not contagious. In Rivet City, Dr. Preston comments that they are burning the corpses just to be safe. In Megaton, Doc Church makes a comments that "it'd be damned ironic if we were so used to the crap we had been drinking that actual pure water was killing us." If the Lone Wanderer drinks four bottles of aqua pura with the modified FEV, they will die.

Locations[edit | edit source]

During The American Dream, John Henry Eden presents the vial to the Lone Wanderer after they are through talking in Raven Rock. They are not be able to leave the room until the vial is picked up.

Related quests[edit | edit source]

Notes[edit | edit source]

  • This item uses the world model of an empty Nuka-Cola bottle, likely because, as a quest item, it can never be dropped by the player.
  • It can be given to Elder Lyons for good karma if you talk to him after you've escaped Raven Rock. With Broken Steel, the modified FEV will be removed from the player's inventory if they activated Project Purity but did not give the modified FEV virus to Elder Lyons beforehand.


  1. 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)