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Isn't that the OPPOSITE of immunity? You're using a drug to supposedly fight off the disease, not the flock. . .
Thus the bird itself has no clue how to actually prepare its body to fight sickness.
Of course I've got some for you too!!
Most of the vaccines are iradiated or other wise injured virus, which makes them very weak, but allows the bird's immunal system a chance to build immunity towards the bug..and the bug in weakened so cannot harm the birds.
Do you vaccinate ?
Do you get a fly shot evey year ?
I did not get one last year despite the commotion of the Mexican flu (H1N1) swine flu from mexico...but maybe I will this year...Cheryl already had a flu this season, maybe it will be bad this year ?
To Ilia: Do you know how measles and mumps was almost entirely eliminated? How polio, which used to be the #1 cause of disability and a big killer of children, was eliminated? By vaccinating a majority of the children, even when one child got sick the rest had antigens so that their lymphocytes (white blood cells) recognized the disease and was able to fight it off. The outbreaks of whooping cough in CA, and other almost eradicated diseases of childhood have occurred in populations of schoolchildren that had a significant number of unvaccinated individuals.
By the way, I just did a paper on the supposed autism and vaccine link. There is NO hard scientific evidence to back that up... not even in studies comparing vaccination records with the number of those children who have autism and visa versa.
If you trade, sell, show, or swap birds, or have anything other than a closed flock, vaccination can be a prudent way to protect your birds health.
As usual, ultasol, you have eloquently and succinctly written what I wanted to say but couldn't find the words for. Good post!