How Do Vaccines Work?

A vaccine works by training the immune system to recognize and fight the pathogens (viruses or bacteria) in case if an infection occurs later on. For this, the pathogen or a part of it must be introduced into the body to trigger an immune response but the pathogen should be killed or weakened first so that the vaccine itself does not cause the disease.

By injecting the pathogen or some of its parts into the body, we actually introduce antigens (foreign particles that induce an immune response) into the body. The immune system can safely learn to recognize them as pathogens, produce antibodies against them, and remember them for the future. If the bacteria or virus reappears, the immune system will recognize the antigens immediately and attack aggressively before the pathogen can spread and cause the disease.

As of now, Vaccines for COVID-19 are yet to be discovered.

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