A vaccine is an antigenic preparation used to produce active immunity to a disease, in order to prevent or ameliorate the effects of infection by any natural or "wild" strain of the organism. The term derives from Edward Jenner's use of cowpox ("vacca" means cow in Latin), which, when administered to humans, provided them protection against smallpox, which Pasteur and others perpetuated. The process of distributing and administrating vaccines is referred to as vaccination.

Vaccines against cancer are also being investigated; see cancer vaccine. In this case, the antigenic preparation is derived from the cancer cell. There is also research on an HIV vaccine.

Origin of vaccines

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Typhoid Vaccine - Twitter Search

Yummy breakfast.... Typhoid Vaccine pills lol http://tweetphoto.com/8213791
W1gg1n (Tom Wiggin) Thu, 07 Jan 2010 17:43:37 -0000
Yummy breakfast.... Typhoid Vaccine pills lol http://tweetphoto.com/8213791
Got my yellow fever vaccine tonight, as well as my first hep A shot and my typhoid fever shot. Almost ready to go to Rwanda!
Kaylotta (Emily Diehl) Thu, 07 Jan 2010 05:40:55 -0000
Got my yellow fever vaccine tonight, as well as my first hep A shot and my typhoid fever shot. Almost ready to go to Rwanda!
Busying myself to go to Kenya tomorrow... I kind of screwed up on the Typhoid vaccine... my plan is to just not get... http://bit.ly/6FvpD4
paulmelley (Paul Melley) Tu Subscribe to Typhoid_Vaccine RSS feed