The common cold is a kind of virus called Rhinoviruses .Rhino viruses are a major cause of the common cold .
More than 200 different viruses are known to cause the symptoms of the common cold. An estimated 30-35% of all adult colds are caused by rhinoviruses. Scientists had previously identified 99 distinct rhinovirus types. Recently, however, a number of unknown types were detected in patients with severe flu-like illnesses.
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