Flu season
occurs annually in countries that have cold weather in the winter. Although the
influenza virus is alive throughout the world in all four seasons, it seems to
have its greatest impact on humans during the winter. Scientists are not sure
why. They think it’s because in the winter people are indoors and close together
for longer periods of time. Also, the virus might be able to live longer and be
stronger in colder weather. Finally, indoor air can dry up the mucous that helps
protect people from the virus.
In the
U.S., the virus is not something to sneeze at. It kills about 36,000 people
annually (most of them elderly). It also causes almost 250,000 people to end up
in a hospital bed annually.
Scientists
develop a preventive flu shot for people to take as winter begins. This shot is
not guaranteed to prevent flu; scientists can only guess at which virus might be
the most dangerous in the upcoming season. The shot protects against only that
particular virus. For those who do not get the shot, influenza spreads among
them easily. It takes only a sneeze, a cough, or a touch. Victims frequently get
ill from shaking hands, opening doors, or handling money.
Most
infected people will have a fever, sore throat, and cough. But the symptoms are
often mild and last for only a week. For many others, however, symptoms can be
so severe and prolonged that victims end up in bed for weeks, or in the
hospital, or in the cemetery.
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