Ok we will be sure to quarantine them! Also, we have called the breeder but no answer. And their is no sign of illness besides the coughing and sneezing, she looks very healthy!Be sure and quarantine these chickens for 30 days from any others that you have in case they may have something contagious. Is there any nasal drainage or foam in the eyes? Respiratory diseases are very contagious, and some may make carriers of your flock. Have you contacted the breeder about their symptoms? Antibiotics such as Tylan or oxytetracycline can treat symptoms in some respiratory diseases, but you don't want to bring chickens into your flock that have diseases.
Ok, thank you!I would start some antibiotics mentioned in post #2, and I would make sure that she is kept warm, either inside or with a heat lamp. Make sure that she is drinking well. If not Tylan 50 injectable can be given orally 1/4 ml for a bantam twice a day for 5 days.