Okay. I'm a mess. New with chickens; had flock about 2 weeks. My Sussex has strange sounds & what I think is sneezing, thought she might have a respiratory thing going on. So, isolated her and put antibiotic in her water and in the larger coop. Now, this morning the larger coop has bloody stools. Is is from antibiotic or something else. I did deworm them at beginning of week. Confused. Do I have a flock of sick birds or what?