Thai social media say that if you accept a blood donation from someone who has already been vaccinated against Covid-19, you could in turn become vaccinated. Is this true or not?
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This is not true because the amount of donated blood is insufficient to transfer the immunity.
Vaccine adjuvants rapidly move from the injection site to the neighbouring muscle cells and lymphocytes in the lymph nodes, and are therefore unlikely (if at all) to end up in the bloodstream. The RNA in the vaccines also breaks down rapidly in the body.
Because of the way donated blood is processed, red blood cell products and platelet products contain very little plasma. The white blood cells have been removed by filtration, which further reduces the possibility of any traces of the vaccine passing into blood products.
The blood transfusion will not then build immunity from the Covid-19 virus in the receiver’s body because the amount of vaccinated blood introduced into the recipient’s body is much smaller than all the unvaccinated blood in their body already.