Maybe a bug?:
Uninfected bears can infect you.
If that's how its suppose to be, will chickens and rabbits get you infected or just anything that bites?
If its in the air, does beathing air have a chance of infecting you? That would make the gas mask head piece the most important thing in the game.
Suspicious behavior:
Two vultures waited until I started reloading then
BOTH attacked immediately. I had waited for them to come in for about 15 seconds, as they were attacking the out hanging right above me.
That was an anti-fun moment.
As in not conducive to enjoyment.
As in "Trollish" behavior (for a modern vernacular).
The answer is, of course, to play the "Circus" theme song during all combat.