TED-ED: Why do you need to get a flu shot every year? - Melvin Sanicas

The video explains why a new flu vaccine is needed annually due to the flu virus's rapid mutation and numerous subtypes. It details how the flu virus uses RNA, which mutates faster than DNA, making it a moving target for vaccines. The flu vaccine works by introducing antigens to the body, prompting an immune response. However, different strains and mutations can evade this response. The World Health Organization selects strains for the vaccine twice a year, aiming for the best match. Vaccination not only protects individuals but also contributes to herd immunity. The video also discusses the safety of flu vaccines and ongoing research for a universal vaccine.

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