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Flu virus particles. Coloured transmission electron micrograph (TEM) of a section through influenza (flu) B particles (virions, round). There are three influenza types (A, B and C). Influenza A and B viruses cause seasonal epidemics of disease almost every winter. Influenza C infections cause a mild respiratory illness and are not thought to cause epidemics. Magnification: x50,000, when printed 10 cm wide.
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