I had a 3-4 week old chick pass away yesterday. It was lethargic and ruffled and a bit unsteady on its legs for over a week before it died. No diarrhea or bloody stools that I noticed. Lost interest in drinking and eating but would eat fermented feed when offered. Any clue what's going on? I don't think it's Merek's but really don't know. Now another chick has been showing similar symptoms for the past 4 days. These chicks were all very healthy when I first purchased them at one week of age.