Earlier quoted context omitted.
> All previous vaccines were aimed at preventing infectious diseases. This is a common misconception, and that's whythe U.S. CDC is now emphasizing that vaccines can do more to help people. The most important recent example is the world's widespread rollout of COVID vaccines. These are primarily aimed at better protection against severe illness, hospitalization, and death; these are not primarily aimed at preventing…
Well that’s just plain revisionist history. Name another example. The flu vaccine, maybe? But that’s because they don’t know which strains to target. Both the CDC director at the time and Biden said the vaccine would prevent you from getting COVID. It’s insane we’re changing the definition of words because the COVID vaccines were kinda crappy and that would be bad politically. Not that the vaccine discussed here shou…
Sure, another example is the flu vaccine as you mention. The primary aim of the flu vaccine in the U.S. medical system is to protect high-risk people from life-threatening symptoms, even during infections from different strains.
Another example is the shingles vaccine. The primary aim is to prevent severe symptoms (such as neural damage and long term pain) during a reactivation of an existing chronic infection.
> It’s insane we’re changing the definition of words
The semantic meaning of the word vaccine hasn't changed. All that's changed is the U.S. CDC official definition text, to clarify that the primary aim of vaccines is to activate the body's immune system, rather than solely to prevent a new specific infection.
If you're curious about the language exactness, beyond the U.S. CDC, the U.S. FDA is also involved. For example, the U.S. FDA during COVID stated that a vaccine would need to be at least 50% effective for diminishing the severity of COVID-19 symptoms to obtain regulatory and marketing approval. In other words, the primary aim was to help people reduce damage; the primary aim was not to full-stop prevent infection.