Hello, and thank you for this forum. We are relatively new to raising chickens and now have a sick Polish Frizzle. The link is to a YouTube video I have posted of her. The video is about a minute seven seconds long, and shows her with what appears to be a cough, repeated opening of her beak, and toward the end of the video, her efforts to walk. She began to display symptoms a few days ago. None of the other 12 chickens have displayed any symptoms. We have her on terramycin, and have separated her from the others. I have been checking the books, but many of the symptoms in the books are overlapping and don't precisely describe what we are seeing. We managed to nurse a silkie back to health, but this one does not appear to have any nasal discharge, and her lungs sounds clear. We thought maybe crop blockage as she sounds like she is trying to clear her throat, but that doesn't make sense with the walk. She seems to eat OK. Any ideas? We figure if it was something really serious, she'd be dead by now, so we are hoping to save her. Thanks in advance for any assistance you can be.