The practice of immunization dates back hundreds years. Buddhist monks drank snake venom to confer immunity bite and variolation (smearing a skin tear with cowpox smallpox) was practiced in 17th century China. Edward Jenner is considered the founder vaccinology West 1796, after he inoculated an 8 year-old-boy vaccinia virus (cowpox), demonstrated smallpox. In 1798, first smallpox vaccine develo...