Vaccines aren't magic barriers.
They don't kill the virus or pathogen they target. Rather, vaccines stimulate a person's immune system to create antibodies. These antibodies are specific against the virus or pathogen for the vaccine and allow the body to fight infection before it takes hold and causes severe disease. However, some people won't have a strong enough immune response to the vaccine and may still be susceptible to developing COVID-19 if exposed to the virus. How a person responds to a vaccine is impacted by a number of host factors, including our age, gender, medications, diet, exercise, health, and stress levels. It's not easy to tell who hasn't developed a strong enough immune response to the vaccine. .It also takes time for the immune system to respond to vaccines and produce antibodies.
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