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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 its 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 . 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.
烤鸭必知:14条雅思阅读高分准则
雅思阅读:NOT GIVEN题型的八大考点
雅思阅读满分需要具备的条件
雅思阅读辅导:锚式擒纵机构的优势
实用镜像法巧解雅思阅读判断题
深度解析A类雅思阅读判断题
解析雅思阅读中的几种省略现象
雅思阅读常见的必备短语(三)
雅思阅读读前读时读后的阅读重点
雅思阅读做题步骤及阅读思路
解析雅思阅读中的倒装形式
雅思阅读技巧:记号标记法
如何处理雅思阅读时间的问题
雅思阅读判断题技巧
雅思阅读常见的必备短语(一)
雅思阅读高分必备
解析雅思阅读选择题
分享第一次做雅思阅读的四大体会
雅思阅读是非判断题的解题技巧
雅思阅读高分需做好基础阅读练习
雅思阅读文章都是哪儿出的?
解析雅思阅读中的主谓一致原则
解析雅思阅读强调句的三种体现
解析雅思阅读分层五原则
如何拿到雅思阅读7分?
雅思阅读:Summary题型解题技巧
解析三大雅思阅读解题方法
不同题型的雅思阅读题的解答技巧
解析雅思阅读简答题
解析雅思阅读超级杀手题的题型特点
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