video below. bought some chickens a week ago, from time to time I heard what sounded like a sneeze or cough but was not able to figure out which chicken did it. Today I found this one like this, already isolated it from the others. the coop is well ventilated and it has wood shavings on it, 1 week old. From time to time she waggles her head very fast left and right and makes higher pitch noises. I read that it if chicken inhale dust it can do them harm. one day, with them all eating furiously, one of them was eating from the ground and there was feed (like powder) dropping on top of another from a feedder a bit higher than this chicken. do you think this can cause this problem? I have already tried to give her water mixed with apple cider vinegar and terramicina (do not know the english name but this is can used for respiratory diseases in chickens). any help?