Your immune system has a "memory," which can be both a good and bad thing. When it comes to COVID boosters, scientists like Washington University's Dr. Michael Diamond found that our body doesn't just "remember" its previous vaccines – it uses that memory to fight viruses it hasn't even met yet. How does the immune system "remember" a brand-new virus? What makes COVID vaccines different from the flu vaccine? And what does this mean for COVID vaccines in the future? Dr. Diamond, lead author of a new study in Nature, explains.
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