Influenza virus. Coloured scanning electron micrograph (SEM) of influenza viruses (green), a cause of human influenza, on the surface of a culture cell (orange). This virus belongs to the orthomyxovirus class of RNA viruses, all of which possess an affinity for mucus. The viruses are surrounded by a protein envelope and covered with specialised molecules called glycoproteins. These attach to the mucoprotein receptors on the surface of host cells of the respiratory epithelium. Influenza is usually short-lived and is seldom serious. This is the Neurotrophic Wilson-Smith (NWS) strain and it is H1N1. Magnification: x14,000 at 6x7cm size. Magnification: x46,000 at 8x10 ins size.

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