I don't get you. It would say more than either 5 or 7 if you'd left it as it was, which is good IMO. The way it is encourages metagame a lot(same goes for blob always being the same biohazard level). I say, either randomize all of them so you can't meta, or go for "there's an unknown biological lifeform", "there's a minor viral outbreak", and "there's a potentially life-threatening viral outbreak" off the bat. The way it is, it just rewards people who know the game and are willing to do subtle metagame.