You can't prevent a "disease" from happening anymore than you can prevent a car crash. But there is more than just air-bags for car crashes. There is crumple zo

You can't prevent a "disease" from happening anymore than you can prevent a car crash. But there is more than just air-bags for car crashes. There is crumple zones, seat belts, a-frames and all kinds of things. So why not discuss all other options for preventing disease? If you say there are none, there is no point in trying to educate you from nothing, go google some stuff about prevention.