The common cold is an infection of the nasal passages and pharynx, usually causing malaise (feeling generally unwell), tiredness, a sore and runny nose, a sore throat, sneezing, and a slight fever. 60% of common colds are caused by rhinoviruses. The rest occur due to infection by coronavirus, influenza viruses, parainfluenza virus, respiratory syncytial virus, adenovirus, and enterovirus. In addition, the bacteria Mycoplasma pneumoniae and Chlamydia pneumoniae may cause common cold symptoms.
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