[Name] Forced Evolutionary Virus [Source] Fallout [Symptoms] 
Originally known as the Pan-Immunity Viron Project, FEV, along with radiation, is responsible for many mutations in the wastelands. The most visible of these are the super mutants, former humans granted incredible strength and endurance as result of being infected. Exposure to the virus is also known to be fatal in many cases. FEV serves as a major plot element in Fallout, Fallout 2 and Fallout 3.