首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health
Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health
admin
2014-06-13
32
问题
Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweeping a cluster of Asian countries.
The race for a vaccine began after the first human case emerged in Hong Kong in 1997. Backed by the World Health Organization (WHO), three research teams in the US and UK are trying to create a seed virus for a new vaccine. Their task is formidable, but researchers remain optimistic". There are obstacles, but most of the obstacles have been treated sensibly", says Richard Webby, a virologist at St. Jude Children’s Research Hospital in Memphis, Tennessee.
The biggest challenge is likely to be the rapidly mutating virus. Candidate vaccines produced last year against the H5N1 virus are ineffective against this year’s strain. Scientists will have to constantly monitor the changes and try to tailor the vaccine as the virus mutates. They can’t wait to see which one comes next.
The urgency stems from fears that H5N1 will combine with a human flu virus, creating a pathogen(病原体) that could be transmitted from person to person. But if people have no immunity to the virus, the strain may not mutate as rapidly in people as it does in birds.
To quickly generate the vaccine, researchers are using reverse genetics, which allows them to skip the long process of searching through reassorted viruses for the correct genetic combination. Instead, scientists clone sequences for hemagglutinin(红血球凝聚素) and neuraminidase(神经氨酸苷酶), the two key proteins in the virus. The sequences are then combined with human influenza genes to create a customized reference strain.
Because products developed with reverse genetics have never been tested in humans, the candidate vaccines will first have to clear regulatory review. In anticipation, the US Food and Drug Administration (FDA) and the European Agency for the Evaluation of Medicinal Products (EMEA) are both preparing pandemic response plans. The EMEA has produced a fist-track licensing program, an industry task force and detailed guidance for potential applicants.
In Europe, a reassortant influenza virus—but not the inactivated vaccine—produced by reverse genetics would be considered a genetically modified organism, and manufacturers would need approval from their national or local safety authorities. The WHO has prepared a preliminary biosafety risk assessment of pilot-lot vaccine, which could help speed up the review.
A preliminary version of their protocol calls for several hundred subjects, beginning with a group of young adults and gradually expanding to include those most susceptible to the flu—children and the elderly". If we had product", says Lambert", it would probably be a couple of months at the earliest before we have early data in healthy adults".
选项
A、flinch from their work.
B、hesitate and feel perplexed.
C、carry on their research.
D、abandon their research.
答案
C
解析
为细节理解题。文章第二段中间提到:"尽管科研工作者的任务艰巨,但是他们还是保持乐观的工作态度"。所以我们可以排除A:逃避工作;和B:犹豫以及迷茫,这两个选项。D选项的后半段说"放弃了研究",正好相反,他们并没有放弃,所以也是不确的。因此正确答案是C。
转载请注明原文地址:https://kaotiyun.com/show/CZO4777K
0
考研英语一
相关试题推荐
Youaregoingtoreadalistofheadingsandatextaboutscience.Choosethemostsuitableheadingfromthelistforeachnumbe
Youaregoingtoreadalistofheadingsandatextaboutscience.Choosethemostsuitableheadingfromthelistforeachnumbe
Readingandwritinghavelongbeenthoughtofascomplementaryskills:toreadistorecognizeandinterpretlanguagethathasb
Readingandwritinghavelongbeenthoughtofascomplementaryskills:toreadistorecognizeandinterpretlanguagethathasb
Thehorseandcarriageisathingofthepast,butloveandmarriagearestillwithusandstillcloselyinterrelated.MostAmer
Britishcancerresearchershavefoundthatchildhoodleukemiaiscausedbyaninfectionandclustersofcasesaroundindustrial
Untilthelate1940s,whentelevisionbeganfindingitswayintoAmericanhomes,companiesreliedmainlyonprintandradiotop
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpeople?AccordingtoarecentstudybytheNationa
Thechancesarethatyoumadeupyourmindaboutsmokingalongtimeagoanddecidedit’snotforyou.Thechancesareequal
—Wouldyouliketocometomybirthdaypartytomorrow?—I’m______gladtocome.
随机试题
前轮前束与外倾的作用分别是什么?
A.鳞癌B.腺癌C.小细胞未分化癌D.大细胞未分化癌E.细支气管肺泡癌肺癌恶性程度最高的类型是
下列关于香港特别行政区立法权的论述正确的是:
下列各项中,应当征收增值税的有()。
美国第一任总统是林肯。()
社区发展工作的评估以居民的满意度为核心。()
这个世界上也许不存在纯粹的、绝对的真相,有的只是事实以及因为看待事实的角度不同而得出的不同结论。正所谓:_________________。因此,我们看待任何事物、任何事情都要有多个视角,不能因为只是看到事物的单一侧面而妄下结论。对一个人来说如此,对一个国
间接正犯又称为间接实行犯,是指利用他人为道具而实施犯罪的实行行为,利用者通过支配被利用者的工具行为实现自己的犯罪意图。利用者与被利用者不构成共同犯罪。它包括以下两种情况:一是利用无刑事责任能力人犯罪;二是利用他人过失或不知情的行为犯罪。根据上述定义,下列甲
AnyAmericanwhohasboughtapackofcigarettessincethemid-60smighthaveseenthehealthwarnings.Itsays,"SURGEONGENERA
Whichofthefollowingisgenerallytrueofallbonds?______.
最新回复
(
0
)