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There are more than 200 viruses that cause the "common cold". 40% of common colds are caused by the rhinovirus. It is a member of the picornavirus family and is small, icosahedral (a 20-faced polyhedron), non-enveloped virus containing one positive RNA strand. Another type of virus that commonly causes a cold is the coronavirus, which causes approximately 20% of common colds. Coronaviruses are pleomorphic (take different forms over the life cycle), but spherical in shape with large, widely spaced club-shaped peplomers.

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15y ago

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