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Mumps virus. Coloured Transmission Electron Micro- graph (TEM) of a mumps virus (at centre left) a member of the paramyxoviridae virus family. The virus has a core of genetic material (RNA) enclosed in a roughly spherical capsid. A protein envelope around the capsid is seen in the form of minute projections from the surface of the virus. These projections are made up of a substance that sticks to the surface of red blood cells (haemagglutinin) and an enzyme called neur- aminidase. Mumps causes fever, headaches and vomiting followed by the swelling of the parotid salivary glands in the neck. Magnification: x50,000 at 6x7cm size.
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