WHO ~Definition of vaccines (2012)

The word “vaccine” originates from the Latin Variolae vaccinae (cowpox), which Edward Jenner demonstrated in 1798 could prevent smallpox in humans. Today the term ‘vaccine’ applies to all biological preparations, produced from living organisms, that enhance immunity against disease and either prevent (prophylactic vaccines) or, in some cases, treat disease (therapeutic vaccines). Vaccines are administered in liquid form, either by injection, by oral, or by intranasal routes

48 pages.

Basic_Concept_of_Vaccination

If you can spare a few dollars for the creators of this website to continue their research to bring you more great content, any amount, no matter how great or small, would be greatly appreciated.