Quote: If I follow my theory there will be at least a milion infected in a week, maybe even 2 milion. So probably that will cut off the helicopters supplylines. That means the helicopters get less fuel... so you will hardly see any helicopters after that time.And if there are no helicopters or (commercial) airplanes flying to other continents or islands, there will be a big part of the world that will have become unreachable for zombies. For example, take Greenland. If there's an outbreak in Europe, and after 2 days the airports are closed, Greenland might have become unreachable if there's 1 flight every 4 days (for example) to Greenland on normal weeks. (Assuming that zombies are stupid and 'brain dead' and can't fly a plane, and assuming that it takes a few hours to become a zombie after you've been bitten).
If it only takes seconds to become a zombie after you've been bitten, there's no way you can get on a plane and go to another country: you'll probably just bite the pilot since you can't think or control yourself.
And the world is big. If zombies can't fly a plane or drive a car, it will take years to get to the other side of the continent, IF they already know where they want to go. If zombies are stupid, brain dead creatures, they'll just wander around without a goal, and you can easily drive to another city 100 km away. If a zombie (accidentally) discovers this new city, kill it: zombies CANNOT communicate with each other: they're brain dead: they can't say to each other what they want to do, they can't tell the other zombies that there are still some humans in another city.
My main point is: if zombies are brain dead, they can't communicate, so they can't tell other zombies where you are, so they won't attack with hundreds at the same time. If zombies eat human flesh, they'll eat other zombies or they'll starve. After that, the remaining, uninfected 99.9% of the world population (200 000/6 billion) can just continue with their daily lives.