Jenova's Virus (POSSIBLE SPOILER)

[Lon611]

this explains a theory of the Jenova cells and Geostigma in FFVII:AC

http://www.ff7citadel.com/compilation/acs_geostigma.shtml

[Masamune·1600]

It seems unlikely that Geostigma corresponds directly to the transformation of the Cetra. Geostigma involves (SPOILER)the conflict between a Gaian's Spirit Energy and JENOVA. This internal conflict can lead to severe sickness, and even death. However, there is no record of the Cetra dying from JENOVA's "virus," nor any record of eluding transformation.

According to Ifalna (that's the spelling, by the way), in the Icicle Inn tapes:

Ifalna: I'm all right... When the Cetra... were preparing to part with the
land they loved... That's when it appeared! It looked like... our... our dead
mothers... and our dead brothers. Showing us spectres of their past.

Gast: Who is the person that appeared at the North Cave? I haven't any idea.

Ifalna: That's when the one who injured the Planet... or the 'crisis from the
sky', as we call him, came. He first approached as a friend, deceived them,
and finally...... gave them the virus. The Cetra were attacked by the virus
and went mad... transforming into monsters. Then, just as he had at the
Knowlespole. He approached other Cetra clans...... infecting them with... the
virus...

Gast: You don't look well... Let's call it a day.

It's certain, however, that JENOVA's actions did not involve Mako. Recall that Mako is condensed Spirit Energy, the stuff of the Lifestream. Not only is the Lifestream inarguably opposed to JENOVA, but Mako in concentrations that can induce mutation does not seem to occur naturally.

Ultimately, the game suggests that both JENOVA and Mako are capable of causing physical mutation. In this case, it was certainly JENOVA, and not Mako.

I dont think it was mako, because mako was around before jenova appeared and it was said that jenova "brought the disease to the planet" (sorry if that was a complete mis quote)

Well, artificially produced Mako was discovered by Shinra long after JENOVA landed and was sealed. Spirit Energy was certainly around before the JENOVA impact. Mako and Spirit Energy are not synonymous, however, even though certain segments of the game lamentably do much to muddle that fact.

I've provided the entirety of the quote above.

[General-Beatrix]

WOW!!! :bigbiggri I'm so convinced! Thanks for explaining it to me!

[Squall of SeeD]

Yeah, as already said, it had nothing to do with Geostigma. (SPOILER)It's the side-effects of an internal conflict between one's Spirit Energy and JENOVA's Cells. The Virus that JENOVA unleashed was most likely its own Cells, something which we know affects people on a mental level and which causes physical transformations.

Kudos to all of you who figured that out.

[Ohhh]

wow, iv just been lookin through your geosite thing and its SOOOOOOOOOOOO detailed, either you have a LOT of time to yourself or your a huge FF7 fan...
by the way your theories are great! I never thought of Vincent as being Sephiroths Dad!! There are so many things about ff7 i wasnt clear about (which also, for me makes ff7 more interestin then the other ffs) and i pretty much get it all now... Thxies