Forget the Bird Flu
It's Zombie Infection that we should fear....
See the Zombie Infection Simulation..... and don't say we didn't warn you about the Zombie Apocalpyse...100,880 dead and rising.
Zombies are grey, move very slowly and change direction randomly and frequently unless they can see something moving in front of them, in which case they start walking towards it. After a while they get bored and wander randomly again.
If a zombie finds a human directly in front of it, it infects them; the human immediately joins the ranks of the undead.
Humans are pink and run five times as fast as zombies, occasionally changing direction at random. If they see a zombie directly in front of them, they turn around and panic.
Panicked humans are bright pink and run twice as fast as other humans. If a human sees another panicked human, it starts panicking as well. A panicked human who has seen nothing to panic about for a while will calm down again.