ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Global flu pandemic. Computer artwork of a globe within an influenza (flu) A virus particle, representing a global flu pandemic. In the virus' lipid envelope are two types of protein spike, haemagglutinin (H) and neuraminidase (N), which determine the strain of virus. These are used for recognising and binding to the host cell.
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