Vaccines are weakened pathogens that are inserted into an individuals bloodstream so their body can develop an immunity to them if they were ever to come in contact with the pathogen later on in life. How this is done in a biological sense is that when these weakened pathogens (bacteria or virus) along with antigens are exposed to the persons immune system their body will recognize them as an invader and B-lymphocytes cells will produce antibodies to attach to the pathogen. Which will allow for the rest of the body’s immune system components, mostly the Killer T-cells to locate and exterminate  the pathogen before it gets the chance to duplicate more of itself using your cells machinery which is what makes you symptomatic and danger to others because you risk spreading it to others via droplets from a cough for instance.

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