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The earliest known route of vaccination was respiratory, by intranasal insufflation of powdered scab material containing variola virus from smallpox patients, reportedly practiced in China as early as the 10th century ad see Chapters 1 and After 15th-century experiments with hypodermic injection, 3 the introduction of the needle and syringe N-S in the midth century by Pravaz, 4, 5 Rynd, 6 and Wood 7 began a new era in medicine.
Pasteur used a Pravaz syringe to inoculate sheep in the famed controlled challenge experiment demonstrating protection against anthrax, after which he honored Dr. Jenner by broadening his predecessor's term—vaccination—to mean the administration of immunizing agents for various diseases, not just smallpox.
With acceptance of the germ theory and resulting sterilization of medical equipment by the early 20th century, 9 and with mass production of needles and glass later plastic syringes by mid century, hypodermic injection became the norm for convenient, accurate, and certain administration of most vaccines and many drugs.
