I have a sussex hen about 24 weeks old. I know she has worms and have been treating for this, she also is sneezing, shaking her head and rubbing her beak against things. I have removed a piece of grass that seemed to be stuck inside her nostril. She also has a cough that makes her sound like a duck!!!! She looks and acts perfectly normal, no discharges from eyes or nostrils, not lethargic at all. I have isolated her from the other hens for now. Is this likely to be the chicken equivalent of a common cold? Is it because of the worms or do I need to do something more to help.