FFVII fandom, a word. Yes, Jenova cells cause Geostigma, that terrible disease that lingers on Gaia after the events of the game. But try to understand: THE FACT THAT THESE ARE CELLS means that it is NOT a virus. Viruses do not HAVE cells, although they infect them. Please learn the difference. Oh look, a wiki to help make the difference clear! Bonus rant: The plural of "virus" is NOT "virus'", nor is the plural of Chocobo, "Chocobo's." Stop abusing the apostrophe, people. read more