what is tha vaccine ? What does
it constiest of ? How to does
vaccine work?
It should be meaningful I have this question in exam , tomorrow I have exam os and it should be short
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1. A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.
2. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.
3. Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body.
4. This weakened version will not cause the disease in the person receiving the vaccine, but it will prompt their immune system to respond much as it would have on its first reaction to the actual pathogen.
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