How is a flock of chickens determined to have "bird flu"? PCR testing? Do the chickens die from the "flu" or are they being culled? The reason I ask is this: Let's say a chicken catches and recovers from "bird flu", but it is a bird flu that IS transmissible to humans. Wouldn't that chicken, if she's an egg layer have just produced an antibody to a dangerous flu?
Didn't they used to grow pathogens for flu vaccines in eggs? Does anyone know how that worked? Instead of culturing the virus in eggs what if we just let the chickens catch the flu and put the antibodies in their eggs naturally. The need for expensive, toxin laden flu shot injections would end, correct?
Thinking even harder: If a virus could be cultured in an egg, doesn't that mean the pathogen is human-bird transmissible already? How did that happen in the first place?
I could be massively incorrect about some of this, so please straighten me out if my thinking is off somewhere.