The principal
reason for the increase in the number of infections in winter weather is the
fact that people tend to remain indoors in cold weather and, thus, are in very
close contact with one another. Proximity allows the spread of many
viruses that cause respiratory infections. In addition, influenza is even
more common in winter because the virus first attacks the Far East in their
summer and then spreads westward and reaches the U.S. by winter. Although
it is preferable that one should stay warm, there is little hard evidence to
suggest that not wearing a hat or exposure of wet hair to inclement weather
increases the risk of infection or, more specifically, pneumonia. The
truth is, the flu and the common cold are both caused by viruses. People
get sick more often in the winter because they're exposed to each other more.
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