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Ingestion vs. Injection
Either way it can end up in the bloodstream.
Anti-vaccine folk seem to worry that vaccines go directly into the blood stream.
Vaccines don't go into the bloodstream.
Anti-vaccine folk worry that "INGESTION is different to INJECTION".
They needn't.
In reality, the immune system and gastro-intestinal system are extremely complicated.
Here we have a very simplified representation of Ingestion vs Injection. Whether the route is injection (intramuscular, subcutaneous, or intradermal) -- or ingestion (oral), the substance goes through a 'filter'.
Antigens and other components of food go through a gut "filter" before entering the blood stream, and the antigens in vaccines go through the antigen presenting cells and tissue "filter" before entering the blood stream.
This is incredibly misleading, as gut microbes trap heavy metal toxins, surrounding it and prepping it for excretion, while muscle tissue and arterial tissue has nothing of the sorts.
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