DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Seasonal flu vaccine. Close-up of a toddler receiving the 2015/2016 seasonal influenza (flu) vaccine. Children over the age of two receive the vaccine as a nasal spray. This vaccine protects against two strains of influenza A, an H1N1 strain and an H3N2 strain, and two strains of influenza B viruses.
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