T-Virus
Ada Wong’s luck finally ran out. After being the shadow figure behind so many Umbrella Corporation related incidents in the past she fell to one of her own ploys. After infecting Jill Valentine with a new strain of the T-Virus, she was unable to put her under her control. Now she knows this would not be seen as a failure to Umbrella Corporation as they will now have a new infected subject to study… Herself.