I remember reading a book that was illustrated kinda in the same style that “schoolhouse rock” was animated with, at least the “I’m just a bill, sitting here on capitol hill” song. Dunno about the rest of the series, never saw it.

In this book they were telling the story about Louis Pasteur and his rabies vaccine, they mentioned pasteurization, but didn’t go into how it worked. The book portrayed the vaccine in a ridiculously oversized syringe, and the vaccine inside was soldiers. Probably French legionaries, but I called them Blue Nutcrackers. That book made me understand at a kid level how vaccines work, and made me comfortable with getting them when I was 6. I wish I could remember what it was called, it really should be required reading.

Edit: Found it! It is called "The Value of Believing In Yourself, The story of Louis Pasteur.

https://m.youtube.com/watch?v=A43eHlEaxPs

That video the lady reads it, but if you fast forward to ≈11:00 she shows the ridiculous syringe.

No clue why the book seems to be ≈ $85-$90 on eBay. Guess it’s out of print.