We have gold(rooster) and silver(hen) seabrights that hatched out 7 chicks. They are about 4 weeks old. One got a goopy eye a couple of days ago- it was the runt so we thought it had been picked on. Anyway, it is doing ok; however, one of the larger chicks started sort of gasping for air today and by this evening it was dead. When we looked under its wing feathers there were not any feathers and some of the skin looked like it had small sores on it. I didn't see any evidence of mites. We have had chickens for years and never had any get sick. The weather here last week was super hot! My son watered down their outdoor pens to keep the ground cool. We haven't seen any evidence of bloody poop. I bought Duramycin and Sulmet today. We are using the Duramycin in the water currently-started it this afternoon. I've looked up everything I can find on the internet. Coryza and mycoplasma seem the most similar to what we have observed, but there is no horrible smell coming from the chicks or their parents. They are all outdoors in a 5x10 foot door kennel with chicken wire wrapped around the bottom 2 feet. I would love to talk to anyone near us who is having similar issues. I've tried calling cdfa, but since it is Sunday and tomorrow is a holiday, we can't speak to anyone. I double freezer bagged the affected chick and put it into the freezer. I don't know if tests can be run on it after it is frozen, but otherwise it would rot. HELP! We don't want to lose any more birds. We also have a leghorn who just hatched 7 chicks last weekend.