Avian influenza is highly contagious and having an outbreak of it very much impacts trade and sales. It can also infect humans that interact with the birds. It also kills rapidly. There is treatment for avian flu but in conditions where there are a lot of chickens, it can be difficult to detect the symptoms early enough to treat and separate that chicken from the entire flock without there being a risk of it spreading as the medication has to be taken by the bird within the first 48 hours of symptoms. This can especially be difficult because chickens in particular hide when sick.
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