Yes. I think this is the key part. We keep talking about healthy birds and sick birds. When you have an incident in a barn and you have sick animals, you need to treat those animals. We have animal welfare regulations in this country that say you must treat that flock.
Generally when you get an outbreak in a disease you have to use a more powerful antibiotic, and you have to use one that is more important for human medicine. That is the resistance we're concerned about.
As Dr. Rosengren tried to point out, it isn't just that it's a healthy bird and it's not just that it's growth promotion, there's a...I think you called it a subclinical part. I wonder if you would repeat that piece for us. I think it's important.