DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Seasonal flu vaccine. Close-up of a nurse holding a box containing doses of the 2013/2014 seasonal influenza (flu) vaccine. This is the nasal spray vaccine used in children over the age of two. The vaccine protects against two strains of influenza A, an H1N1 strain and an H3N2 strain, and one strain of influenza B viruses.
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