Palerider, can't you see that if bird flu hit the world in full force then there would be a shortage of this vaccine, and it would cost money and the hospitals would either run out or charge people. And when it comes down to life and death, corruption will be rife and the rich will get the vaccine first.
This is all assuming that we can even make a vaccine 8 months after it starts at the earliest.
It may last about 2 years and come to your neighborhood in a few waves during this time.
By the time the vaccine is available you may not need it - you could be dead or immune.