“how many flu vaccines exist?”
even if you are smart enough to come up with the question, neither google (nor any other search engine) will present you with an answer of any kind.
the basic answer: at least 8.
the real answer: dozens.
so if the flu has at least 8 vaccines and yet still manages to kill 80K americans … hmm … finish and answer the rest of that question yourself. you can think.
the short answer: google can’t think.
the longer answer: google was designed as an ad revenue generating engine and it’s really good at avoidance of anything that won’t generate revenue. as a result it prioritizes click-bait and bait-and-switch answers instead of knowledge or facts.