时间:2019-01-14 作者:英语课 分类:VOA标准英语2011年(八月)


英语课

US Scientists Expand Scope of HIV Vaccine 1 Study


The world’s largest ongoing 2 HIV vaccine study has been expanded to consider multiple ways a vaccine might boost immune response to the AIDS virus. The U.S. Institute of Allergy 3 and Infectious Diseases (NIAID) is testing the safety and efficacy of a dual 4 vaccine candidate.

It’s called the HVTN 505 study and has been underway since June 2009. HVTN stands for the HIV Vaccine Trials Network, which is funded by the National Institutes of Health.

“The trial is being expanded both in terms of the number of participants, as well as what the trial is looking to answer,” said Mitchell Warren, head of AVAC, the AIDS Vaccine Advocacy Coalition 5, who’s following the study’s developments.

Broader study

Enrollment 6 is increasing from about 1300 to 2200 participants.

Originally, the study focused on whether the vaccine regimen could lower the amount of HIV in the blood if people were to become infected after being vaccinated 7. It did not focus on whether it could actually prevent infection. Now it does.

The change stems in part from encouraging results in 2009 of the RV-144 vaccine trial in Thailand. The trial proved protection is possible, although the effectiveness was too low to go to market.

Warren said, “Because of the Thai trial, what we saw in that vaccine actually preventing infection was, wow, we really need to then look differently at HVTN 505 and expand its ability to look at the question: could this vaccine actually also prevent infection, prevent acquisition of HIV?”

Learning more, doing better

In AIDS vaccine research in the 1980s and 90s, there really was little, if any, success in getting vaccine candidates to give a protective effect. So, the emphasis switched to whether vaccines 8 could mitigate 9 the infection.

Warren says there are two basic immune system responses to infection.

“We have the antibody response, or the humoral immunity 10, which conceptually is the part of the body that could help prevent infection. And then we have what’s called cell mediated 11 immunity, which is the part of the immune system that will help modulate 12 the disease if one were to be infected,” he said.

The HVTN 505 study will now try to activate 13 both of those systems.

“It uses a prime boost combination of two different vaccines. One is a DNA 14 vaccine that has snippets of HIV that can’t cause HIV at all, but is meant to kind of prime the immune system. And then it has an Adeno 5 vaccine boost,” said Warren.

Adeno 5 is actually a common cold virus. It’s used as a vector or means of delivering the vaccine.

Choose carefully

All the participants in the study fall under the UNAIDS category of Men who have Sex with Men, or MSM. The latest U.S. data show the group has a very high HIV infection rate, particularly young men of color.

It’s important for medical studies to carefully choose a target group.

“Every trial is unique and to the degree that a trial can ask a very specific question in a very specific population, the better we can answer the question. If we just created a vaccine trial or a treatment trial and said anybody can be in our trial, we just want bodies, at the end of the day we would look at the answer and say we don’t know what this means because these people were so different,” said Warren.

The HVTN 505 study is being conducted in 12 U.S. cities. The executive director of the AIDS Vaccine Advocacy Coalition calls this the most exciting time in HIV vaccine research.

The study is being led by Scott M. Hammer, M.D., the chief of NIAID’s Division of Infectious Diseases and the Harold C. Neu professor of medicine in the College of Physicians and Surgeons at Columbia University.



n.牛痘苗,疫苗;adj.牛痘的,疫苗的
  • The polio vaccine has saved millions of lives.脊髓灰质炎疫苗挽救了数以百万计的生命。
  • She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。
adj.进行中的,前进的
  • The problem is ongoing.这个问题尚未解决。
  • The issues raised in the report relate directly to Age Concern's ongoing work in this area.报告中提出的问题与“关心老人”组织在这方面正在做的工作有直接的关系。
n.(因食物、药物等而引起的)过敏症
  • He developed an allergy to pollen.他对花粉过敏。
  • The patient had an allergy to penicillin.该患者对青霉素过敏。
adj.双的;二重的,二元的
  • The people's Republic of China does not recognize dual nationality for any Chinese national.中华人民共和国不承认中国公民具有双重国籍。
  • He has dual role as composer and conductor.他兼作曲家及指挥的双重身分。
n.结合体,同盟,结合,联合
  • The several parties formed a coalition.这几个政党组成了政治联盟。
  • Coalition forces take great care to avoid civilian casualties.联盟军队竭尽全力避免造成平民伤亡。
n.注册或登记的人数;登记
  • You will be given a reading list at enrollment.注册时你会收到一份阅读书目。
  • I just got the enrollment notice from Fudan University.我刚刚接到复旦大学的入学通知书。
[医]已接种的,种痘的,接种过疫菌的
  • I was vaccinated against tetanus. 我接种了破伤风疫苗。
  • Were you vaccinated against smallpox as a child? 你小时候打过天花疫苗吗?
疫苗,痘苗( vaccine的名词复数 )
  • His team are at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。
  • The vaccines were kept cool in refrigerators. 疫苗放在冰箱中冷藏。
vt.(使)减轻,(使)缓和
  • The government is trying to mitigate the effects of inflation.政府正试图缓和通货膨胀的影响。
  • Governments should endeavour to mitigate distress.政府应努力缓解贫困问题。
n.优惠;免除;豁免,豁免权
  • The law gives public schools immunity from taxation.法律免除公立学校的纳税义务。
  • He claims diplomatic immunity to avoid being arrested.他要求外交豁免以便避免被捕。
调停,调解,斡旋( mediate的过去式和过去分词 ); 居间促成; 影响…的发生; 使…可能发生
  • He mediated in the quarrel between the two boys. 他调解两个孩子之间的争吵。
  • The government mediated between the workers and the employers. 政府在工人与雇主间搞调和。
v.调整,调节(音的强弱);变调
  • Please modulate the sound on the TV.请调节一下电视的音量。
  • This system could modulate the voice signal effectively.这个系统可以对语音信号进行有效的调制。
vt.使活动起来,使开始起作用
  • We must activate the youth to study.我们要激励青年去学习。
  • These push buttons can activate the elevator.这些按钮能启动电梯。
(缩)deoxyribonucleic acid 脱氧核糖核酸
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
学英语单词
-s
5'-Deoxyadenosyl-B12
acid fast red
Aegerita
albumin milk
almeida pilosa
amoralists
amphoteric ion-exchangeresin
anti-impact gear
batouti
blast furnace smelting
bunss
cabinetmaker
cauliflora
CD Video
Churumuco
COBOL transaction program
collapsible keel block
corecipients
dihydropyrimidinase
direct exporttrade
draw-
drip-drying
escrowing
esterifiable
Ethydan
ethyl cyanamide
filtered signal
fire bricks
flamdoodle
Florence crystals
foam solution
folded potential
forestry production statistics
fully arisen sea
general fixed assets group of accounts
genus Hamamelis
genus irenas
Grecian nose
groaners
Guengant
Haskins
hcb
ill-humo(u)redly
in conjunction with
input/output stream control
inseminating catheter
insured risk
joint buying office
Kentish fire
lande's g factor
Lincolnshire
look-at-me signal
magon
managed economies
merphenyl
metropolitan broadband network
mobile control room
Muncimir
national switching network
network for arc welding
non-metered tap
not the done thing
nuclei cochleares
Oetinghausen
pastures newer pastures
Pelargonium limoneum
pen lid
penetration method
permeably
Ping Pong buffer
powerful radio-frequency cable
pump for sludge tank
punctuation space
Quinalspan
redalder
reduced flange
regulating error
requirement for tax exemption
self-skill
shape straighten
shelf front
ST_including-and-excluding_covering-and-adding-layers
suele
taper-reamer
taste acuity
technico-
telecommunication route
throw up one's hat
transiliac
travel card
triatic
uncountry
variation in testing temperature
vibroplatform
Villaputzu
Virtual File Allocation Table
vision distance
well-illuminated
what are we waiting for
yester-morrows
z transform inverse