A weakened or dead form of a pathogen makes up a vaccine.
In immunology, a vaccine is a substance given to stimulate the production of antibodies by the body and provide defense against a disease without causing the disease itself in the treatment.
A vaccine prepares the immune system ahead of an actual infection, hence, it is produced using the pathogen causing that particular disease itself but its weakened or dead form.
Therefore, a weakened or dead form of a pathogen (disease-causing agent) makes up a vaccine.
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