日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

 
 
 

HIV superinfections appear common

2012-06-13 16:29

 

Get Flash Player

Download

They're called HIV "superinfections" and a study indicates they're much more common than first thought. Researchers say this raises concerns about possible resistance to treatment and may require new approaches to AIDS vaccine research.

Dr. Andrew Redd said there are HIV infections and then there are superinfections.

HIV superinfections appear common

"A superinfection occurs when an individual is initially infected with a strain or strains of HIV. And then at some point later on – after that person has developed an initial immune response to their first infecting strain – at that later time point they come into contact through risky behavior with a second viral strain and then are superinfected with that second strain," he said.

Redd is the lead author of the study and a scientist at the National Institute of Allergy and Infectious Diseases. He said prior to the research done in Uganda it was thought that superinfections were rare, occurring in intravenous drug users or men who have sex with men. Not so.

"What we found in our study was that when we looked at a general population of heterosexual individuals in Uganda we found that it actually isn't as rare as what we thought. And that it is occurring at a significant rate even in the general population," he said.

So how does a person become superinfected? Well, it has to do in part with where you are and what HIV subtypes are prevalent.

"There's geographic separation between what we call the HIV subtypes, or clades. One of the interesting things about where we work in Uganda is it is at sort of the crossroads of two of those clades. The clades are labeled and named by letter – A, B, C, D. And in Uganda, we have subtype A and subtype D," said Redd.

Continued risky behavior after initial infection could lead to infection by another subtype of HIV. Current testing methods will confirm whether a person is HIV positive. But they cannot determine what HIV subtypes caused the infection. For that, the researchers need what's called "viral sequencing" -- an in-depth, complicated look at the viral DNA.

Left untreated, superinfection could lead to an accelerated progression of HIV/AIDS. Redd says, though, that standard antiretroviral treatment should be effective against superinfections.

"We have no evidence so far and we don't think that HIV superinfection affects the response to treatment. From what we can tell, individuals who get superinfected respond to treatment just fine and it lowers their viral load and they get healthier. One of the things that we're worried about, though, if the possibility that an individual could get superinfected with a viral strain that is already resistant to the antiretroviral drugs and that would be a major problem. But to date that doesn't seem to be a huge risk so far," said Redd.

Superinfections could also affect how HIV vaccine research is conducted. For example, there are individuals who are at risk of HIV superinfection but do not become superinfected. They are somehow protected.

He said, "One question would be what natural immune response to their initial infection is protecting them from the superinfection. And if we can figure that out that may give us a very interesting avenue to pursue for HIV vaccine research."

Redd added that current HIV vaccine strategies that try to "recreate the natural immune response may be insufficient to protect an individual from infection."

superinfection: 雙重感染

Related stories:

US considers approving drug to prevent HIV

Campaign aims to help end childhood HIV infections

New studies on HIV treatment as prevention

Better treatment for HIV-positive pregnant women

(來源:VOA 編輯:旭燕)

 
中國日報(bào)網(wǎng)英語點(diǎn)津版權(quán)說明:凡注明來源為“中國日報(bào)網(wǎng)英語點(diǎn)津:XXX(署名)”的原創(chuàng)作品,除與中國日報(bào)網(wǎng)簽署英語點(diǎn)津內(nèi)容授權(quán)協(xié)議的網(wǎng)站外,其他任何網(wǎng)站或單位未經(jīng)允許不得非法盜鏈、轉(zhuǎn)載和使用,違者必究。如需使用,請與010-84883561聯(lián)系;凡本網(wǎng)注明“來源:XXX(非英語點(diǎn)津)”的作品,均轉(zhuǎn)載自其它媒體,目的在于傳播更多信息,其他媒體如需轉(zhuǎn)載,請與稿件來源方聯(lián)系,如產(chǎn)生任何問題與本網(wǎng)無關(guān);本網(wǎng)所發(fā)布的歌曲、電影片段,版權(quán)歸原作者所有,僅供學(xué)習(xí)與研究,如果侵權(quán),請?zhí)峁┌鏅?quán)證明,以便盡快刪除。

中國日報(bào)網(wǎng)雙語新聞

掃描左側(cè)二維碼

添加Chinadaily_Mobile
你想看的我們這兒都有!

中國日報(bào)雙語手機(jī)報(bào)

點(diǎn)擊左側(cè)圖標(biāo)查看訂閱方式

中國首份雙語手機(jī)報(bào)
學(xué)英語看資訊一個(gè)都不能少!

關(guān)注和訂閱

本文相關(guān)閱讀
人氣排行
熱搜詞
 
 
精華欄目
 

閱讀

詞匯

視聽

翻譯

口語

合作

 

關(guān)于我們 | 聯(lián)系方式 | 招聘信息

Copyright by chinadaily.com.cn. All rights reserved. None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited. 版權(quán)聲明:本網(wǎng)站所刊登的中國日報(bào)網(wǎng)英語點(diǎn)津內(nèi)容,版權(quán)屬中國日報(bào)網(wǎng)所有,未經(jīng)協(xié)議授權(quán),禁止下載使用。 歡迎愿意與本網(wǎng)站合作的單位或個(gè)人與我們聯(lián)系。

電話:8610-84883645

傳真:8610-84883500

Email: [email protected]

主站蜘蛛池模板: 日韩欧美在线免费观看 | 国产精品一区二区三区99 | 国产精品久久久久久久久久久久 | www.国产在线 | 国产综合亚洲精品一区二 | 欧美日韩在线一区二区三区 | jiucao在线看片www | 摸金校尉之九幽将军 | 亚洲综合一区二区三区 | 色情女教师3波多野结衣 | 9999久久| 狠狠狠狠狠狠狠狠狠狠 | 欧美成人性性 | 国产91亚洲精品 | 91精品影视 | 99影视在线视频免费观看 | 四虎亚洲 | 欧美日韩视频在线 | 成人黄色免费在线观看 | 亚洲无毛| 国产精品视频一区二区三区不卡 | 久草在线免费播放 | 国产日韩一区二区三免费高清 | 国产萝控精品福利视频免费观看 | 午夜资源 | 91在线视频免费观看 | 麻豆短视频app网站 天天澡天天碰天天狠伊人五月 | 国产午夜永久福利视频在线观看 | 六月婷婷综合激情 | 亚洲综合在线播放 | 亚洲黑人在线观看 | 男女激情免费视频 | 中文字幕第页 | 杀破狼在线观看 | 亚洲一区中文字幕在线观看 | 北条麻妃国产九九九精品小说 | 98香蕉草草视频在线精品看 | 成人在线网 | 国产福利视频一区 | 九九九久久久久久久爱 | 亚洲天堂网站 |