[Name] T-Virus [Source] Resident Evil [Symptoms] 
(short for Tyrant Virus, after the humanoid BOWs it is used to create) A virus that causes dementia and cellular necrosis in humans, turning them into zombie-like creatures who are difficult to kill. It can easily mutate into other strains, some of which have mutagenic effects on the host. In insects or amphibians, the resulting mutation often involves increased aggressiveness, increased size, and (almost always) the development of poisonous traits. In mammals, the results include aggressiveness, physiological changes of varying degrees, and an extremely increased evolutionary rate. However, it is shown that some humans can bond with the T-Virus and its variants and gain heightened speed, strength and strange powers while retaining their personalities, as in the case of Albert Wesker and Alexia Ashford. Variants include the NE-T virus, T-G Virus, the T-JCCC203 (used for pharmaceutical, but killed two people) and many others.