(Capcom's primary storyline)
The G-Vaccine (codenamed DEVIL) was a counterpart to the G-Virus developed in the Raccoon City Underground Laboratory as an extension to Drs. William and Annette Birkin's G Project. As a vaccine, it was able to stimulate the human immune system to create antibodies capable of fighting the G-Virus. While the vaccine was able to prevent massive mutations in the infected when injected early, cellular regeneration could still be enhanced.