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Small-Scale Question Sunday for January 8, 2023

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Vaccines are intentionally designed to produce a strong immune response even in minuscule quantities. That goes as far as adding adjuvants to increase the antigenicity of a base antigen. Not to mention that they're usually given parenterally, meaning that the immune system is exposed to a higher concentration than is typical for normal allergens that are inhaled or contact spread.

So, does it mean if I injected somebody (non-allergic) with peanut butter extract mixed with an adjuvant (provided I find a safe way to do it without causing them harm) they'd get a peanut allergy?

Conversely, if somebody were vaccinated, e.g. against flu, and subjected constantly to low doses of flu virus - would they lose the immunity eventually? If not, again, why does it work with allergens and not with the flu virus?

In the first case, unless they already had a genetic predisposition to peanut allergies, it's unlikely that they'd develop an allergy at all. They might develop a local hypersensitivity reaction at the time of injection, but I don't believe that it'll go as far as making normal peanut butter eaten later an allergen.

In the second case, I'm unsure myself.

Conversely, if somebody were vaccinated, e.g. against flu, and subjected constantly to low doses of flu virus - would they lose the immunity eventually

If you have some immunity to the flu, but it's spreading around your community, you are subjected constantly to low doses of flu virus!