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
36
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 if we live without any microorganisms?
选项
A、We will never be involved in the allergies.
B、We will eradicate the outbreaks of many infectious diseases.
C、We may miss an important part of human development.
D、We may find no effective medical cure to many diseases.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2957615.html
相关试题推荐
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
Turningtocrimeisinthegenes,accordingtonewresearchcarriedoutint
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtoascientificstudypublishedinApril,2007,birdshaveshownt
AccordingtothemostrecentAmericanFreshmansurvey,conductedannuallyby
AccordingtothemostrecentAmericanFreshmansurvey,conductedannuallyby
TheOnlyChild:RevealingtheMythsAccordingtotheGut
TheOnlyChild:RevealingtheMythsAccordingtotheGut
TheOnlyChild:RevealingtheMythsAccordingtotheGut
随机试题
Aprimaryvalueinearlytwentieth-centuryModernistarchitecturaltheorywa
Youmanageabusiness,stocks,bonds,andpeople.Andnowyoucanmanage
Itisclearthathumanhistorywillend;theonlymysteryiswhen.Itisals
A
在TCP/IP协议分层结构中,SNMP是在UDP协议之上的()请求/响应协议A.
场外期权一方通常根据另一方的特定需求来设计场外期权合约。通常把提出需求的一方称为
患者出现全身泛发性丘疹、斑丘疹2天,9天前有因感冒服用阿莫西林史,2天前躯干起针
关于煎药操作规程,下列说法错误的是()。A.煎药人员收到待煎药后,应核对处方药
A.二陈汤B.温胆汤C.滚痰丸D.川芎茶调散E.半夏白术天麻汤风痰上扰,眩晕头痛
下面关于征收征用房地产补偿的说法中,错误的是( )。A、房地产征用后被损毁,补偿
最新回复
(
0
)