Is the blood donated by those vaccinated against coronavirus safe for the patient?

The vaccines do not contain SARS-CoV-2 virus that causes COVID-19 or any fractions of the virus. The so-called viral vector vaccines do not contain any disease-causing or viable viruses either.

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. The coronavirus vaccines used cannot attach to the human genome (DNA) and therefore cannot modify it.

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. Once the vaccine has produced antibodies, a very small amount of these is transferred to the blood recipient, but this is not enough to protect the patient.