flu

H1N1 flu is spreading widely across the world. In order to ensure a safe and happy winter vacation, the Students’Union calls on each of us to take measures to prevent the H1N1 flu efficiently.First of all, a positive attitude is necessary. H1N1 flu is preventable and curable, so there’s no need to panic, and keeping our spirits up can always make a big difference. Besides, it’s important to ensure our personal hygiene, especially frequent hand-washing with soap and water, the simplest but the most effective way. In addition, our own immune system, which plays a vital role in keeping us safe from the H1N1 flu or any other disease, should be strengthened without any hesitation. To achieve this, were supposed to maintain a healthy diet, do exercise regularly and get enough sleep as st but not least, try to avoid close contact with people who are sick and places crowded with people, like shopping malls and supermarkets, so as to reduce the chance of getting infected. Nothing is more worthy of our attention than our health. Only when we have a healthy body can we really enjoy the holiday and our life. Act now.
Flu is a common infection of the nose and throat, and sometimes the lungs. The cause is a virus that passes from one person to another. The virus spreads through the air when an infected person expels air suddenly. Flu develops after the virus enters a person's nose or
mouth. The flu causes muscle pain, sudden high body temperature, breathing problems and weakness. Generally, most people feel better after a week or two. But the flu can kill. It is especially dangerous to the very young, the very old and those with weakened defenses against disease. Medical experts have recognized for some time that people become infected with flu during the winter months. But they did not really know why until recently. American researchers say they now know why the flu virus spreads in the winter and not in the summer. They say it is because the virus remains in the air longer when the air is cold and dry. Researchers in New York carried out twenty experiments with guinea pigs to investigate how the virus spreads. The researchers found the virus spread the most when the temperature was about five degrees Celsius and the humidity was twenty percent. Few of the guinea pigs developed flu as the temperature increased. The virus stopped spreading completely at thirty degrees Celsius and eighty percent humidity. The researchers also found that the animals spread the virus among themselves nearly two days longer when the temperature was low. One of the researchers said the study shows that flu virus is more likely to infect people during an outdoor walk on a cold day than in a warm room. He said cold air helps the virus survive in the air and low humidity helps it stay there longer. That is because particles of the virus ride on the extremely small drops of water
floating in the air. When the air is very humid, water droplets fall to the ground more quickly. The researchers say, however, that people should not stay in warm places all the time in cold weather to avoid the flu. They say the best way to prevent the sickness is to get yearly injections of a vaccine that prevents flu.。