I'm having a little bit of a stress. I bought four new hens a couple of weeks ago. All were fine and I integrated them into the flock after 14 days. However, one is now showing signs of illness. She was sleeping with head under her wing, and when I picked up her, she is sneezing a little, has clear mucus from her beak and seems to be snapping her beak a lot - as if clearing away excess snot. She doesn't have a rattle to her breath, and her poop since I isolated her again has been good. She hasn't eaten since I re-quarantined her though; layers pellets, oats or even scrambled egg - nothing. She is drinking though and I added a little tonic as a pick-me-up. Now I'm looking at the rest of my hens and - probably - over worrying. One has her tail a little lower, another was sneezing this morning (I think it was actually dust) and another was sleeping and puffed up. On their own these aren't anything to worry about but since i have this ill hen, I'm concerned she's spread something through the flock before I've managed to catch it. Does anyone have any advice on what to do next? The isolated hen, other than not eating and the sneezing, looks fine; no puffiness in face, no bubbles in her eyes or anything. She's a little listless, but is standing and walking around, bright eyes, and red wattles and comb. She laid only one egg since I got her - which she broke and ate - but that's probably down to stress of being rehomed. I've been online most of the night reading up on respiratory illness symptoms, and it could well be one of those. If so, how fast does it spread to others and show clear signs? Can I expect to be looking at a flock who all have runny noses, or does it present gradually and differently in various hens? To look at, the flock looks happy and showing normal behaviour but, as you can imagine, I'm now quite worried about possible outcomes to this.