I had a 3-month old marans pullet who just started showing signs of some sickness. She's wheezy and sneezing, sometimes a bit of a rattle to her. Her droppings have also been abnormally loose. I isolated her in a warmer environment and gave her supportive measures (yogurt in food, apple cider vinegar in water).

So far no others show her signs. In my past years with poultry I've never had ones with a respiratory ailment. The weather's turning a bit colder and they are within range of airborn disease from two other neighboring flocks.

I just moved so I don't have access to all of my poultry books, nor internet so I'm posting this in case I don't make headway in a few days. Honestly I don't think it's cause for panic just yet.