Influenza A viruses. Coloured digitised Trans- mission Electron Micrograph (TEM) of influenza A viruses. At centre right and lower left, rounded viruses are seen (yellow); broken viral coats are also visible. Influenza A virus is a contagious orthomyxovirus, more virulent than influenza type B. It contains a core of ribonucleic acid (RNA), surrounded by a spiked protein coat (seen here) of haemagglutinin. These spikes adhere to host mucous cells in the respiratory tract. The virus is transmitted when coughed or sneezed. Influenza A causes fever, headache, muscular aches & fatigue. Magnification: x600,000 at 35mm size.
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