Stock Photo - Reasercher examining a culture flask containing Madin_Darby Canine Kidney epithelial cells MDCK, and looking for any signs of growth of a stock of influenza virus. There are three types of influenza viruses : types A, B and C. Influenza A viruses are divided into subtypes based on two proteins on the surface of the virus: the hemagglutinin H and the neuraminidase N. The current subtypes of influenza A viruses found in people are A H1N1 and A H3N2.Centers for Disease Control and Prevention CDC, Atlanta, USA.

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