DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Seasonal flu vaccine. Nurse injecting the upper arm of a patient with the 2012/2013 seasonal influenza (flu) vaccine. This 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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