Daylight
From Multiversal Omnipedia
Created by Peter Jenkins with the help of Greg Muller, Daylight is the only true cure for the T-Virus. It is made using the following ingredients: P-Base, V-Poison, and T-Blood. One dose will instantly cure an individual infected with the virus, provided that they haven't already regressed into a zombie. If, however, the indivual is a zombie or any other creature whose life force is dependant upon the T-Virus, then Daylight will instantly kill them.