Thanks, I will look into the bacteria/virus thing.
With the former male/female. I intend to have some missions early game with Emile that I hope will smooth out these issues. They will likely be unique to whatever gender you picked and if male, focus on that sort of thing.
But regardless the MC will still probably end up quite accepting of the situation since it saved their life and, without the new body there would have been no possible way to survive.