New Attempts to Eradicate AIDS Virus
A high-profile attempt to eradicate the AIDS virus in a few patients continues to show promise.
But researchers won't know for a year or more whether it will work, scientist David Ho told journalists here Wednesday for the Fourth Conference in Viruses and Infections.
"This is a study that's in progress," says Ho, head of the Aaron Diamond AIDS Research Center, New York.
The study involves 20 people who started combinations of anti-HIV drugs very early in the course of the disease, within 90 days of their infections. They've been treated for up to 18 months. Four others have dropped out because of side effects or problems complying with the exacting drug system.
The drugs have knocked the AIDS virus down to undetectable levels in the blood of all remaining patients, s And, in the latest development6, scientists have now tested lymph nodes and semen from a few patients and found no virus reproducing there, Ho says. "Bear in mind that? undetectable does not equal absent," Ho says.
Ho has calculated that the drugs should be able to wipe out remaining viruses -- at least from known reservoirs throughout the body -- in two to three years. But the only way to prove eradication would be to stop the drugs and see if the virus comes back8. On Wednesday, Ho said he wouldn't ask any patient to consider that step before 2years of treatment.
And he emphasized that he is not urging widespread adoption of such early, aggressive treatment outside of trials9. No one knows the long-term risks.
But other scientists are looking at similar experiments. A federally funded study will put 300 patients on triple-drug treatments and then see if some responding well after six months can continue to suppress the virus on just one or two drugs, says researcher Douglas Richman of the University of California, San Diego. Some patients in that study also may be offered the chance to stop therapy after 18 months or more, he says.
According to the passage, the attempt to eradicate the AIDS virus
A.continues to be hopeful.
B.will be successful in a year.
C.will be successful in future.
D.will stop being hopeful.
第1题
IPSec是IETE以RFC形式公布的一组安全协议集,它包括()与()两个安全协议,其中()不支持保密服务。
第2题
IPSec IETE以RFC形式公布的一组安全协议集,它工作在OSI/RM的(1)。该协议的(2)机制不支持保密服务。IPSec的密钥管理包括密钥的确定和分发,其支持的密钥管理方式是(3)。
(1) A.数据链路层 B.网络层 C传输层 D.应用层
(2) A.AH B.ESP C.SA D.IKE
(3) A.手工密钥分配 B.自动密钥分配 C.动态密钥分配 D.手工密钥分配和自动密钥分配
第3题
阅读以下说明,回答问题1至问题5。
[说明]
某企业采用Windows 2000操作系统部署企业虚拟专用网(VPN),将企业的两个异地网络通过公共Internet安全地互联起来。微软Windows 2000操作系统当中对IPSec具备完善的支持,下图给出了基于Windows 2000系统部署IPSec VPN的网络结构图。
IPSec是IETF以RFC形式公布的一组安全协议集,它包含了AH与ESP两个安全机制,其中(1)不支持保密服务。
第4题
(1)IPSec是IEEE以RFC形式公布的—组安全协议集,它包括AH与ESP两个安全机制,其中哪一种不支持保密服务。
(2)IPSec的密钥管理包括密钥的确定和分发。IPSec支持哪两种密钥管理方式。试比较这两种方式的优缺点。
(3)如果按照以下网络结构配置IPSecVPN,安全机制选择的是ESP,那么IPSec工作隧道模式,一般情况下,在图中所示的四个网络接口中,将哪两个网络接口配置为公网IP,哪两个网络接口配置为内网IP。
(4)在Internet上捕获并分析两个内部网络经由Internet通信的IP数据报,在下列3个选项中选择正确选项填写到相应空缺处。A.ESP头B.封装后的IP包头C.封装前的IP包头
(5)IPSecVPN与L2TPVPN分别工作在OSI/RM的哪个协议层?
第6题
A.IPSec中AH协议为报文提供数据源认证、完整性检测和重放攻击保护
B.IPSec中ESP协议还提供了数据保密和有限数据流保密
C.IPSec中IKE协议用来选择加密算法。
D.IPSec中SA称之为安全关联,它决定了两个主机间通信的安全特征
第7题
A.对于 IPv4,IPsec 是可选的,对于 IPv6,IPsec 是强制实施的
B.IPsec 提供对 IP 及其上层协议的保护
C.IPsec 是一个单独的协议
D.IPsec 安全协议给出了封装安全载荷和鉴别头两种通信保护机制
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