首页
登录
职称英语
According to the "hygiene hypothesis," first proposed in 1989, exposure to a
According to the "hygiene hypothesis," first proposed in 1989, exposure to a
游客
2023-08-25
24
管理
问题
According to the "hygiene hypothesis," first proposed in 1989, exposure to a variety of bacteria, viruses and parasitic worms early in life helps prime a child’s immune system, much like sensory experiences program his brain. Without such early instruction, the immune system may go in disorder and overreact with allergies to foods, pollen and pet fur or turn on the body’s own tissue, setting off autoimmune disorders.
Many of these microorganisms evolved symbiotically(共生地)with humans over millions of years— the so-called "old friends" theory. But where they’ve been eradicated, a key part of human development has been thrown off. "The vast majority of microbes are harmless. There are only a few dozen that can cause lethal infections," says Thomas McDade, director of the Laboratory for Human Biology Research at Northwestern University.
In 1998, about one in five children in industrialized countries suffered from allergic diseases such as asthma(哮喘), allergies and rashes, according to the International Study of Asthma and Allergies in Childhood, a global research initiative. The incidence of peanut allergy in the US tripled between 1997 and 2008, according to a report from Mount Sinai School of Medicine in New York. But such diseases are still relatively rare in Africa and rural Asia. "The geographical distribution of allergic and autoimmune diseases is a mirror image of the geographical distribution of various infectious diseases," says a report by French researchers devoted to the hygiene hypothesis.
Exposure to immune-stimulating germs may also lower the risk of heart disease, according to Dr. McDade. But there are other dangers lurking in muddy water and animal feces. Michael Bell, an infectious disease specialist and deputy director of Healthcare Quality Promotion at the Centres for Disease Control and Prevention, says that people should be vigilant about wound care since bacteria can cause problems if they get into the blood stream, and he still advocates hand-washing. "If you’re not doing it ten times a day, you’re probably not doing it enough," he says. But he and other experts say that regular soap and water arc fine in most cases. Sterilizing hands is critical mainly for health-care workers and in hospitals, where disease-causing germs are prevalent and can easily spread.
Many experts advise common sense. "We don’t want to say to children, OK, play by the dirty river bank and catch whatever you can,"says Dr. Weinstock. "But we can say there’s nothing wrong with kids playing in the dirt. They don’t have to live in total sanitation(环境卫生), and they won’t die from eating something off the floor. It’s probably more healthy than not." [br] What can we learn from the last paragraph?
选项
A、Children should be encouraged to play in dirty places.
B、More efforts should be made in public health.
C、Parents needn’t worry about children playing in the dirt.
D、Excessive cleanness is required at home but not outdoors.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2957618.html
相关试题推荐
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtothemostrecentAmericanFreshmansurvey,conductedannuallyby
AccordingtothemostrecentAmericanFreshmansurvey,conductedannuallyby
TheOnlyChild:RevealingtheMythsAccordingtotheGut
随机试题
[originaltext]Doyouliketoeatquickly?Doyoulikeinexpensivefood?Som
《礼拜六》刊物是属于什么流派的刊物()A.现代派 B.为人生的艺术派 C.
在图所示的情况下,为了防止保温层受潮,隔汽层应设置在何处? A.焦渣和混凝土的
分析项目投资的经济效率,具体可以采用的经济费用效益分析指标包括()。A:经济净
柱式轮廓标安装时其逆反射材料的表面应与道路行车方向平行。()
合伙协议应对合伙企业的( )等事项作出约定。 Ⅰ.记账、会计年度、审计 Ⅱ
创业投资基金投资于种子期、初创期、快速扩张期和()初期的企业。A.成熟 B.
对于非意定信托只承认法定信托,不承认默示信托。()
患者,女,65岁。身体素弱,饮食稍有不慎即呕吐未消化食物,面色白,倦怠乏力,四肢
关于城市生活无着的流浪乞讨人员的救助管理,下列表述不正确的是()A.流浪乞
最新回复
(
0
)