Influenzavirus B, TEM

Influenzavirus B, TEM


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Influenzavirus B. Coloured transmission electron micrograph (TEM) of the influenza B virus. The rod and circles here are different expressions of the same virus. This virus is the cause of influenza (flu) in humans. It consists of a RNA (ribonucleic acid) core in a protein coat, or capsid, which is surrounded by an envelope. The capsid contains haemagglutinin (H) and neuraminidase (N) proteins, which allow the virus to enter and leave host cells. The virus reproduces by entering cells and hijacking their biochemical machinery, producing many copies of itself. One such host is the rod- shaped bacterium seen at lower left. Flu usually causes lethargy, aching muscles, fever and nausea. Influenza B is less virulent than influenza A, due to its limited host range. Magnification: x125,000 when printed 10 centimentres tall.

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