My 8 week old Black Marans became lame 5 days ago, in her flock of 18 other pullets. She is the only one exhibiting symptoms. My first guess was Marek's, but I was hoping someone could help me try to figure out what is wrong with her. She is eating and drinking when I feed her by hand, but cannot get her head into the feeder or waterer on her own. I considered that the problem might be an ear infection, so I have been treating her with an antibiotic for 3 days - while she is stronger (I'm sure it's because she's eating and drinking), she still cannot stand (or fly). All of these birds came from a reputable hatchery in Iowa, but were not vaccinated. I guess I'm wondering if it is Marek's, wouldn't the other birds be affected by now too?