I came home tonight and let the chickens out for free range time. One of my EE's is making noise each time she exhales, and makes a delicate suppressed sneeze sound. She just started laying in the last week or so. She layed an egg today, and is out and about with her usual cohorts, acting normally otherwise. I should say that a few weeks ago one of the other chickens picked at her, and plucked all but two of her tail feathers. Should I be concerned? Could this be contagious?