Additional points that may be helpful - this vaccine - for the current avian flu - is not really experimental as much as it is in clinical trials. There is a big difference between the two. And finally I think it takes some pretty large antigenic changes to make a vaccine completely ineffective. This one looks very good to me. Give me 50% crossover and I believe the survival rate will skyrocket for this bug.
The vaccine has been in clinical trials. It appears to be effective against H5N1. But it has some major drawbacks. It requires several doses given several weeks apart. It is not in commercial development for the public, it is being produced and stockpiled for the government. Please refer back in this thread around 1200 or so and to Mother Abigails recent post in the last day or two.