I am new to the world of chickens, and will be getting my first chicks in a few weeks. I am anticipating what may come down the road for my "flock" of a few chickens, and I suspect I will want to add more. I've been reading that, in the interest of sparing your existing flock from disease, new bugs, etc., it is necessary to quarantine any new adult birds. Is this an extreme bit of caution? Is this really necessary if your adult bird comes from a reputable owner. I'd love to hear others' experiences with this, particularly if your new additions have brought pathogens in to the flock.