CajunGirl, they haven’t been able to cut down the production rate over the last thirty years that I am aware of.
They start early in the year and the vaccine isn’t broadly available until the September time frame, sometimes as late as October/November. And if something goes wrong with the batch (something you don’t find out until just before release), the corporation creating the vaccine, will not provide product that year.
About five years ago, we had an instance where half the needed supply for the nation failed it’s testing, and couldn’t be released.
It can get real ugly when hospitals, retirement centers, clinics, and public health departments go scrambling.
It may be too late to get vaccine for this ready by this fall. I don’t honestly know for sure.