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by afterburner
1639 days ago
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Because of the way your immune system works. Vaccines aren't medicine, they work by provoking an immune response. What happens after that immune response is triggered is way more complicated than just "molecule X get response Y", there are multiple stages of responses, and the deeper, longer span ones create a resilience against mutations as well. It is extremely common for a proper vaccination regimen to require multiple doses, and it has entirely to do with how the immune system works. |
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