Or perhaps actually reading the manufacturers product package inserts, studying the ingredients, and making a logical educated decision is a trend now ;)

Surely nothing to do with sanitation, nutrition, clean water, health care, you know, all the things we have now but didn’t back then and undeveloped nations where polio is rife still don’t.....

Of course you’ve already asked yourself and researched why things like aluminum, formaldehyde, polysorbate 80, mercury etc. are in vaccines and what they do to humans when injected straight into our body ;)