If we’re still talking about the OP question - Rush isn’t wrong on that
I'm wondering if you actually listened to what Limbaugh said.
He claimed that the flu shot was not not a vaccine
It most certainly is a vaccine. (You do understand what the term, quadrivalent means right???)
And he is also right on the flu vaccine, we don’t know what the next strain of the flu will look like so we just kind of guess using last 6 months worth of flu strains.
Correct, but Limbaugh didn't say that. His misunderstanding of this fact was his rationale for claiming it wasn't a vaccine.