The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Now, that's why it's called the adaptive immune system. And in many ways it creates a memory of a prior infection so that these antibodies can be made anytime that same invader comes back again, all right? And so, this is the basis of what we call immunity.
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as I mentioned earlier the Adaptive immune system then acquires a memory of the specific fit between a given antibody that it made and the viral Invader and the successful battle that those antibodies waged on that Viral Invader and that memory is maintained such that if the next week or the next season you encounter the exact same serotype of cold virus or same type of flu virus well then you already have antibodies ready to be deployed
but then in an amazing way your adaptive immune system also maintains a memory of that battle and keeps within your body believe it or not within a population of stem cells that such that if you ever encounter that same serotype of cold virus or same strain of influenza again that your antibodies can immediately neutralize that colder flu virus
Now what happens during the initial encounter either be a vaccination or an infection is those B cells or those T- cells that have a receptor that is able to recognize the pathogen will become amplified and they will turn out large amount of the antibbody or or or the T- cell clones once the job has been done they will contract but it will not contract back down to the same level, they will become what we call memory T cells or memory B cells.