There is no scientific reason to why people get more colds, however people get the flu more in winter because influenza thrives on cooler temperatures and tends to rapidly increase during that season. Despite higher incidence of manifestations of the flu during the season, the viruses are actually transmitted throughout populations all year round. Each annual flu season is normally associated with a major influenzavirus subtype. The associated subtype changes each year, due to development of immunological resistance to a previous year’s strain (through exposure and vaccinations), and mutational changes in previously dormant viruses strains.
Another idea published in the New England Journal of Medicine suggests that colds in winter are more psychological. The winter season tended to produce increased stress levels due being without sun and locked indoors. Stress lowers the immunity system, thus resulting in sickness.
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