Vaccines are broadly classified by how the antigen(s) are prepared. ![]() To read more about the history of vaccines, please visit: Types of vaccinesĪn antigen is the active ingredient of the vaccine that generates an immune response against a specific disease-causing organism. ![]() The concept of variolation (deliberate infection) occurs even earlier in history, with smallpox survivors in 430 BC being called upon to nurse the afflicted. Before Edward Jenner (an 18 th century scientist considered to be the founder of vaccinology), the practice of immunisation was recorded in 17 thcentury China, where Buddhist monks drank snake venom to create immunity to snake bites. The concept of immunisation is far from a modern idea.
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