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Flu viruses

Flu viruses

M055/0385

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Credit

KARSTEN SCHNEIDER / SCIENCE PHOTO LIBRARY KARSTEN SCHNEIDER / SCIENCE PHOTO LIBRARY

Caption

Flu viruses. Conceptual image of influenza viruses (brown) in the airways of the lung. The virus particles are not at the same scale as the lung cilia (blue). Each virus consists of a core of RNA (ribonucleic acid) genetic material surrounded by a protein coat (brown). Embedded in the coat are surface proteins (spikes). There are two types of surface protein, haemagglutinin and neuraminidase, and each exists in several subtypes. Both surface proteins are associated with the pathogenicity of a virus. Haemagglutinin binds to host cells, allowing the virus to enter them and replicate. Neuraminidase allows the new particles to exit the host after replication.

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