(Covers information from the D.C. comics)
According to Barry Burton, the G-virus is an updated form of the T-virus. Its main difference from "T" is that it can be spread between people, whereas Zombies infected with the older virus cannot.
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The somewhat contradictory descriptions of the G-virus is due to the independence of storywriters. One writer portrayed it as an entirely unique virus, while Ted Adams ("Dangerous Secrets") portrayed it as an enhanced T-virus with the same effects like Zombification.