Discussion
How do COVID vaccines stimulate an immune response?
Answer: A
The answer is by introducing a harmless piece of SARS-CoV-2 virus.
Most COVID-19 vaccines present the immune system with a harmless part of the virus, usually the spike protein or the genetic instructions for making it (as in mRNA and viral-vector vaccines). The body makes antibodies and T cells against it, and is then ready if the real virus enters.
No COVID vaccine introduces a real, live virus that can cause disease, and live attenuated vaccines were not the approach used. Introducing ready-made antibodies is passive immunisation, as in monoclonal antibody therapy, not vaccination.
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