Oneman not sure if it's too late to change the story a little bit. It seems odd to me for any one to develop a bioweapon and unleash it on the world for a cheating partner. Maybe have it be some secret mystery to find out in game of what organization, reason, purpose (Whether it's some dictator, eco terrorist, or revolutionists, or etc.). It could add to the fun factor of the game of trying to figure it out. Like there are evidence it could be one of several organization responsible and you gotta find out which one is the culprit, infiltrate the organization or government, find the individual responsible, try to black mail or coerce into giving you cure, etc. Just free advice to help you in the story development.