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
外语
When Did Aids Begin? The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly bef
When Did Aids Begin? The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly bef
admin
2022-05-07
78
问题
When Did Aids Begin?
The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly before the waves of violent rebellion that followed the liberation of the Belgian Congo. A seemingly healthy man walked into a hospital clinic to give blood for a Western backed study of blood diseases. He walked away and was never heard from again. Doctors analyzed his sample, froze it in a test tube and forgot about it. A quarter century later, in the mid-1980s, researchers studying the growing AIDS epidemic took a second look at the blood and discovered that it contained HIV, the virus that causes AIDS.
And not just any HIV. The Leopoldville sample is the oldest【C21】________of the AIDS virus ever isolated and may now help solve the【C22】________of how and when the virus made the leap from animals (moneys or chimpanzees) to【C23】________, according to a report published last week in Nature. Dr. David Ho,【C24】________of the Aaron Diamond AIDS Research Center in New York City and【C25】________of the study’s samples, says DNA pushes the putative origin of the AIDS【C26】________back at least a decade, to the early "50s over even the "40s.
Over the【C27】________15 years, scientists have identified at least 10 subtypes of the【C28】________virus. But they couldn’t tell whether they were seeing【C29】________on one changeable virus or the handiwork of several【C30】________viruses that had made the jump from primates to man. A【C31】________look at the genetic mutations in the Leopoldville sample strongly【C32】________that all it took to launch the AIDS epidemic was one unlucky【C33】________of events.
By comparing the DNA of the 1959 virus with that of【C34】________taken from the "80s and "90s, Ho and his【C35】________constructed a viral family tree in which the Leopoldville isolate sits right【C36】________the juncture where three subtypes branch out. The 39-year-old【C37】________is also strikingly similar to the other seven subtypes. The clear implication: all the viral【C38】________can be traced back to a single event or a closely related group of【C39】________. One theory is that AIDS started through contact with infected monkeys in a【C40】________area and spread to the rest of the population through urbanization and mass inoculations.
The findings underscore how rapidly HIV can adapt to its surroundings, making it devilishly difficult to develop effective vaccines. No one knows how many more subtypes of HIV will sprout in the next 40 years, but chances are they will be every bit as lethal as the ones we see today, if not more so.
【C35】
选项
答案
colleagues
解析
转载请注明原文地址:https://kaotiyun.com/show/IYMO777K
本试题收录于:
CATTI二级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI二级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
CountriesontheAfricancontinentcanswiftlytacklechallenges.
CountriesontheAfricancontinentcanswiftlytacklechallenges.
Accordingtothespeaker,howmanypoundsofthebeefproductswererecalledonTuesday?
Accordingtothespeaker,howmanypoundsofthebeefproductswererecalledonTuesday?
ThetophealthconcerninCentralandEasternEuropewastopreventandtreatHIV.
随机试题
下列枚举类型的定义中,包含枚举值5的是
根据规格尺寸的不同,轮胎分为哪几类?
购买动机是购买行为的基础,请简述几种购买动机。
跨步电位差是指()。
争端裁决委员会(DAB)做出的解决争端的决定,()。
在伊索寓言中有个《狐狸与葡萄》的故事,说的是一只狐狸很想得到已经熟透了的葡萄,于是它跳起来去够,结果不够高,于是又跳起来,再跳起来……想吃葡萄而又跳得不够高,这也算是一种“挫折”或“心理压力”了。此时此刻那狐狸该怎么办呢?若是一个劲地跳下去,就是累死也还是
求下列定积分:
Thefollowingparagraphsaregiveninawrongorder.ForQuestions41-45,youarerequiredtoreorganizetheseparagraphsintoa
在带宽为3 kHz且没有噪声的信道中,传输二进制信号能够达到的极限数据数率为(81)。而在一个带宽为3 kHz信噪比为30dB的信道中,其极限数据传输率为(82)。由此可知(83)。由奈奎斯特第一定理,为了保证传输质量,达到3kb/s的数据传输率需要的带宽
WhendidtherallygathernotfarfromtheWhiteHouse?
最新回复
(
0
)