I have stepped on multiple nails in my life, stabbed myself in my left knee, been poked, cut, scraped, scratched and stabbed my all kinds of rusty metal…never got tetanus…might have had the vaccine before I was 5 or 6 but haven’t had any vaccine since then (circa 1995) and I’m pretty sure you were supposed to get tetanus boosters every so often…proper hygiene and proper wound care will keep you from getting most infections stemming from open wounds, generally speaking.