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- Minor disease of the upper respiratory tract,
- caused by a variety of viruses. Symptoms are
- headache, chill, nasal discharge, sore
- throat, and occasionally cough. Research
- indicates that the virulence of a cold
- depends on psychological factors and either a
- reduction or an increase of social or work
- activity, as a result of stress, in the
- previous six months. There is little
- immediate hope of an effective cure since the
- viruses transform themselves so rapidly.
-