A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. There are 2 main types of vaccines:
1.prophylactic – prevent or ameliorate the effects of a future infection by a natural or “wild” pathogen.
2. therapeutic – fight a disease that has already occurred, such as cancer).
How do vaccines work ?
A vaccine typically contains a biologically prepared part of a virus from a disease-causing microorganism. The preparation is often made from weakened or dead forms of the microbe, its toxins, or one of its surface proteins. This modified form stimulates the body’s immune system to recognize the agent as a threat. In response, the immune system produces antibodies against the agent. These antibodies prepare the body to recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future.
How does the Covid19 vaccine work?
The new COVID vaccine works a little bit differently than the typical vaccine. It doesn’t use any part of the virus at all—instead it’s made with a short-lived RNA sequence that your body can use to produce a tiny (but very identifiable) portion of the virus…sort of like creating a sketch of a suspect. Your body then naturally destroys this portion, but not before your immune system learns to recognize the virus and gets ready to react quickly when it sees the real thing.