Like all medications, "ten years" is the average time it takes for a formulated and developed vaccine to undergo testing and scrutiny to receive FDA approval for use.
Yet, how many medications have been recalled and had approval rescinded for harming people?
Why do people think that vaccines are immune from such an end? (Pun fully intended).
Supposedly the flu starts out every year in poultry in CHIna, sickening the Chinese people before beginning it's annual jaunt around the world.
There are A and B strains of influenza that vaccines are made to resist.
Based on the prevalent strain in China, the world inoculates against that strain.
However, sometimes the opposite strain will be prevalent in other countries.
You get "immunized" against A but get B.
But China had A, where did B come from? What about the mutations that have occurred? How has influenza not been eradicated? Will this result in "super flus"?
It is snake oil peddled by charlatans to make a dime.
The pharmaceutical companies get extremely wealthy by making you sick enough to need the medicine, and just well enough to stay alive to keep buying the medicine. Your doctor is the drug dealer.for the "Big Pharma" cartel.
Just as a body gets weaker and sicker from a sedentary lifestyles and gorging on processed foods manufactured and distributed to the human "feed lot", so goes the human immune system.
Just one viewpoint to consider.
Do your own research, make your own choices.