User blog comment:Mr.shadow/Special infected perks/@comment-1516079-20091106192017

Alright: Confirmation that there are in fact special perks assigned to some infected: Put in the console sv_cheats1 and than spawn_leaker_boomer. It's a boomer except armored on the front and instead of atracting the horde with it's bile it puts on a spitter like bile except highly flamable.