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The average cold lasts for approximately nine days, or for as long as it
takes the infected person's immune system to kill enough viruses to stop the
symptoms. The stronger your immune system, the faster you recover. Due to the
large number of cold viruses - 100 or more - people do not develop immunity to
colds as they do to many other viral diseases. Exposure to one strain does not
offer protection from others. This simple fact explains why it's been so
difficult for researchers to devise a cold vaccine. To date, the best defence is
a strong immune system.