Research has shown that there are many strains of each virus, each having different degrees of virulence. Infection in one strain could possibly result in immunity to another. Chilling of the body may contribute in part, but it is not a major cause of the cold. There is not a specific cure or drug to fight the common cold, however large doses of Vitamin C can shorten the duration of a cold and help to make the symptoms more mild. Bed rest is strongly recommended and antibiotics are often administered.
Colds are the primary cause of absenteeism in schools and industry.
Tiredness and Fatigue Sleep is the natural state of rest characterized by reduced body movement and decreased awareness. It is easily interrupted by external stimulations, such as a loud noise or changes in temperature. Humans cycle between REM, Rapid Eye Movement, and NREM, Nonrapid Eye Movement, in very regular patterns. This is the time when vivid dreams occur and the brain waves are short and rapid. During NREM breathing and hear rates slow down and body temperature and blood pressure decrease.