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研究:儿童对新冠病毒可能有抵抗力,因为经常感冒

文章来源:admin    时间:2020-06-22

    科学家指出,儿童常常伤风可能会维护他们免受新冠病毒的损伤。英国国家统计局的数据显现,儿童和大人相同简单感染新冠病毒,可是开展成重症的儿童没有多少,有些乃至没有表现出症状。 Children may be protected from coronavirus because they catch so many colds, scientists have suggested.   Figures from the Office for National Statistics (ONS) suggest children are just as likely to pick up the virus, but few ever develop serious disease, or even show symptoms.   Now scientists have suggested that children may be resistant1 because their immune systems are already well primed by the common cold.   The common cold is caused by four different types of coronavirus which circulate in the community and are largely harmless. But while adults pick up a cold around two to four times a year, school age children catch an average of 12 colds annually2, studies have shown.   Professor Sir John Bell, Regius Professor of Medicine, University of Oxford3 told the House of Lords Science and Technology Select Committee, that it may allow youngsters to build up some ongoing4 resistance that adults do not have.   “How you respond may be due to the state of your existing immunity5 to coronaviruses generally,” he told peers.   “There is an interesting speculation6 at the moment, that suggests that many people in young or middle aged7 groups may have T-cells that can already see coronavirus. It may well be able to provide some protection against this pathogen when it arrives.   “A lot of kids get seasonal8 coronaviruses and it’s pretty common in our population and many will have quite a strong immunity to coronaviruses generally.   “That is unproven, but there is evidence now for cross-reactivity at T-cell level at least, and that well might help dampen the effects of the virus when we get it.”   Studies have shown that by the age of four, some 70 percent of children already have antibodies against seasonal coronavirus, which could offer important protection.   Professor Adrian Hayday, Chair, Department of Immunobiology, King's College London said the immune systems of young people may simply be better at reacting to new viruses.   “All adults past a certain age - 30 to 35 - eventually have no thymus so their T-cells work by looking at whether they have seen something before, whereas children are very good at seeing things that are completely unknown.   The scientists also said that older people may suffer from immune cell ‘senescence’ where their immune cells start to shut down but are not cleared away and replaced with a working version.     But Prof Bell said for most people coronavirus was not a serious illness.   “The people who get severe disease and die, the vast majority are elderly people and when young people get this disease they tend not to suffer very much.   “That might be the state of people’s immune system at different ages. 70 percent of the people who get this are completely asymptomatic, so at one end of the spectrum9 this is not a bad viral disease, at the other end it’s terrible.   “The vast majority of people who get this disease don’t even know they’ve had it.”  
1 resistant      adj.(to)抵挡的,有抵挡力的 参阅例句:
  • Many pests are resistant to the insecticide.许多害虫对这种杀虫剂有抵挡力。
  • They imposed their government by force on the resistant population.他们以武力把自己的控制强加在持抵挡情绪的公民头上。
2 annually      adv.一年一次,每年 参阅例句:
  • Many migratory birds visit this lake annually.许多留鸟每年到这个湖上作短期停留。
  • They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
3 Oxford      n.牛津(英国城市) 参阅例句:
  • At present he has become a Professor of Chemistry at Oxford.他现在已是牛津大学的化学教授了。
  • This is where the road to Oxford joins the road to London.这是去牛津的路与去伦敦的路的集合处。
4 ongoing      adj.进行中的,行进的 参阅例句:
  • The problem is ongoing.这个问题没有处理。
  • The issues raised in the report relate directly to Age Concern's ongoing work in this area.陈述中提出的问题与“关怀白叟”安排在这方面正在做的作业有直接的联系。
5 immunity      n.优惠;革除;豁免,豁免权 参阅例句:
  • The law gives public schools immunity from taxation.法令革除公立学校的交税责任。
  • He claims diplomatic immunity to avoid being arrested.他要求外交豁免以便防止被捕。
6 speculation      n.思索,深思;猜想;投机 参阅例句:
  • Her mind is occupied with speculation.她的脑筋忙于考虑。
  • There is widespread speculation that he is going to resign.人们遍及估测他要辞去职务。
7 aged      adj.年迈的,陈年的 参阅例句:
  • He had put on weight and aged a little.他胖了,也老点了。
  • He is aged,but his memory is still good.他已年迈,但是记忆力还好。
8 seasonal      adj.时节的,时节性的 参阅例句:
  • The town relies on the seasonal tourist industry for jobs.这个乡镇依托时节性旅游业供给就业机会。
  • The hors d'oeuvre is seasonal vegetables.餐前小吃是应时蔬菜。
9 spectrum      n.谱,光谱,频谱;规模,起伏,系列 参阅例句:
  • This is a kind of atomic spectrum.这是一种原子光谱。
  • We have known much of the constitution of the solar spectrum.关于太阳光谱的构成,咱们已了解不少。

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