DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Influenza vaccine syringes. The pre-filled syringes of Enzira, an influenza (flu) vaccine, contain inactivated virions, or particles, of three strains of the flu virus. The strains are those thought most likely to cause outbreaks in 2006 and 2007, and are chosen by the World Health Organisation and the European Union. Vaccines provide protection against disease by priming the body's immune system, without causing infection. White blood cells are produced that can fight any future infection with the same, or similar strains, of flu virus. Due to the virus' ability to produce new strains, a new vaccine is needed each year. Enzira is produced by Chiron Vaccines.
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