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How do you get the flu?

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Most commonly, the virus travels through the air in liquid droplets from coughs and sneezes . Viruses prefer the wintry conditions of cold air with low humidity. In humid air, the droplets grow heavy with water and fall to the ground-or to other surfaces.

Answer 2: Flu is caused by a virus, which is a microscopic agent that infiltrates living cells and commandeers their machinery to reproduce more viruses. The flu virus, which attacks the respiratory system, is passed from one person to another primarily in droplets of body fluids expelled when the infected person sneezes, coughs, or even talks. A pandemic occurs when an outbreak affects many people over a wide area. Six ways to protect yourself: cover that cough, wash hand, ventilate your home, keep it clean, if sick, try to stay home and avoid personal contact.
Answer also:Today we know that influenza is caused by a virus and that it can be spread from person to person in respiratory secretions expelled by coughing, sneezing, and talking.* It is present worldwide even in the Tropics, where it can strike year-round. In the Northern Hemisphere, flu season runs from November to March; and in the Southern Hemisphere, from April to September.

Influenza type A, the most dangerous type of flu virus, is small in size compared with many viruses. It is usually spherical, with projections from its surface. When this virus infects a human cell, it reproduces so rapidly that often within about ten hours, a swarm of between 100,000 and a million new influenza virus "copies" explode from the cell.

The scary characteristic of this simple organism is its ability to change quickly. Because the virus reproduces so rapidly (far faster than the HIV virus), its many "copies" are not exact. Some are different enough to escape the immune system. That is why we face different flu viruses every year, which present a new set of antigens-substances that test our immunity. If the antigen changes sufficiently, our immune system has little defense against it and there is risk of a pandemic
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