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Clinical virology

Clinical or medical virology is a branch of medicine (more particularly of clinical pathology) which consists in isolating and/or in characterising one or several viruses responsible for some human pathologies by various direct or indirect techniques (cellular Cultures, serologies, biochemistry, molecular biology). A major branch of virology is virus classification. Viruses can be classified according to the host cell they infect: animal viruses, plant viruses, fungal viruses, and bacteriophages (viruses infecting bacterium, which include the most complex viruses). Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipid envelope). Viruses range in size from about 30 nm to about 450 nm, which means that most of them cannot be seen with light microscopes. The shape and structure of viruses has been studied by electron microscopy, NMR spectroscopy, and X-ray crystallography.