I bought an adult pair of Salmon Faverolles yesterday, they are currently in quarantine away from my flock. Seemed good yesterday, but this morning the hen has a bit of a rattle when she breathes. Both are just a year old, 2015 hatch. Hen is bright and alert, eating and drinking (if a little unsure of her surroundings). I can't see any discharge either from her nostrils or eyes. Any ideas what might be going on?