Just like the flu. Here is a nice paper that goes through all the cardiac, neurological, renal and other organ complications of influenza.[1]

[1]https://onlinelibrary.wiley.com/doi/full/10.1111/irv.12470

Just like the flu... which we vaccinate for and doesn’t sweep through the population.

So... not like the flu in scale or scope.

The vaccine is true, but not "doesn't sweep through the population". The CDC estimates 35M Americans got the flu last year.[1]

[1]https://www.cdc.gov/flu/about/burden/index.html