The T-Virus is a fictional virus from the Resident Evil video game series created by Capcom. It is known for its ability to reanimate dead tissue, leading to the creation of zombies and other mutated creatures. The virus was developed by the Umbrella Corporation as part of their bioweapons research. In the series, the T-Virus spreads through bites or contact with infected blood, causing severe symptoms in humans. Those infected often lose their cognitive functions and become aggressive. The virus plays a central role in the storyline, driving the conflict between characters and the various bio-organic threats they face.