What If Your Arm Falls Off Right After a Vaccine?

The video explains how vaccines work by teaching the immune system to recognize pathogens. Vaccines are injected into the arm because skeletal muscle is highly vascularized, allowing the vaccine to quickly enter the bloodstream and lymphatic system. Research shows that vaccines can still be effective even if the injection site is removed shortly after administration. The video also discusses why certain muscles are preferred for injections and the importance of proper technique to ensure vaccine efficacy.

What new insight or understanding did you gain from this video?