H1N1 Flu vaccine - controversy (cyan syringe close-up) I - Stock Image

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Description
Flu Shot (Vaccine) concept image. Concern regarding safety and effectivness of the H1N1 flu shot.

A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains a small amount of an agent that resembles a microorganism.

The term vaccine derives from Edward Jenner's 1796 use of the term cow pox (Latin variol
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