The vaccines that purport to roll multiple into one (like MMR) are clinically the most dangerous, and the theory behind this is that the pathogen pieces interact with each other in the solution to form things much nastier that were not anticipated to happen. Which can have horrible outcomes like brain damage, sterility, and other serious long term affects. Even vax companies begrudgingly admit stuff like this happens (search for 'mmr vaccine risks') and you know how much they lie about everything else..
Ideally zero is the number to aim at, but looking at the risks of all is still a constructive exercise.
Beware the term 'quadrivalent'
https://www.cdc.gov/flu/prevent/quadrivalent.htm
The vaccines that purport to roll multiple into one (like MMR) are clinically the most dangerous, and the theory behind this is that the pathogen pieces interact with each other in the solution to form things much nastier that were not anticipated to happen. Which can have horrible outcomes like brain damage, sterility, and other serious long term affects. Even vax companies begrudgingly admit stuff like this happens (search for 'mmr vaccine risks') and you know how much they lie about everything else..
Ideally zero is the number to aim at, but looking at the risks of all is still a constructive exercise.