Since nobody else is bothering to explain it, there’s a very good reason the avian flu vaccine is not used regularly in almost any country. The vaccine makes the chicken likely to survive the flu, but it does nothing to prevent infection. So instead of AF outbreaks being detected and the unfortunate birds culled, you would have entire farms incubating thousands of chickens full of AF virus, creating perfect conditions to mutate and potentially spawn a new strain which may wind up being resistant to the existing vaccine. Meanwhile, those infected chickens will be spreading AF to every wild bird for miles around. It’s not a useful tool for prevention, it’s our last ditch protection if AF gets completely out of control on a global scale.
Since nobody else is bothering to explain it, there’s a very good reason the avian flu vaccine is not used regularly in almost any country. The vaccine makes the chicken likely to survive the flu, but it does nothing to prevent infection. So instead of AF outbreaks being detected and the unfortunate birds culled, you would have entire farms incubating thousands of chickens full of AF virus, creating perfect conditions to mutate and potentially spawn a new strain which may wind up being resistant to the existing vaccine. Meanwhile, those infected chickens will be spreading AF to every wild bird for miles around. It’s not a useful tool for prevention, it’s our last ditch protection if AF gets completely out of control on a global scale.