How long does covid vaccine last - How long do mRNA and spike proteins last in the body?

The vaccine triggers other parts of the immune system that keep an infection from getting out of control.

Killer T cells are shown attacking a virus-infected cell or tumor.

While more research is needed, there could be variations in immune responses from person to person based on such factors as age, medical conditions, and medications they may be taking.

With so many vaccines emerging in the market it has also become easier for health experts to evaluate their effectiveness.