https://www.amazon.com/Turtles-All-Way-Down-Vaccine/dp/9655981045

TL;DR virtually all vaccines are only tested for safety by comparison with other vaccines, which themselves may have adverse events, rather than against a placebo which does not.

This obscures any general side effects of vaccines.

The control vaccines themselves are either tested against other vaccines (hence the title), or date from a time before clinical trials.

And anyone who thinks pharma and the medical establishment can be trusted, please google opioid crisis, maddie de garay, vioxx for starters.