Question

What are vaccines and how do they work in a human body

Answer 1

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A vaccine is a biological preparation that provides active acquired immunity to a particular disease. 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. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future. 
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Answer 2

vaccines are none other than inactive pathogens when they are injected in humans body then the WBCS entrap a gene of the pathogen and give it to the B cells now the b-cells develop resistance and pass the information to T cells now the t cells kill the bacteria with the gene given to them that's how vaccines work thank you mark this as the brainliest answer brainliest answer if you find it relevant enough