One thing to add is that many people were told they are allergic to penicillin by their parents as a result of developing a rash after its use as a child. Often this rash was a result of the infection itself or from toxins released by the bacteria when they were killed and not actually an allergy.
WellThatTickles t1_j2egvfx wrote
Reply to ELI5: If penicillin became the pinnacle antibiotic why are many of us now allergic? by stealth941
One thing to add is that many people were told they are allergic to penicillin by their parents as a result of developing a rash after its use as a child. Often this rash was a result of the infection itself or from toxins released by the bacteria when they were killed and not actually an allergy.