(单词翻译:单击)
听力文本
From VOA Learning English, this is the Health Report.
Hundreds of thousands of children become infected with the AIDS virus every year. There boys and girls are born to mothers who have HIV, the human immunodeficiency virus. Infection takes place during pregnancy or from breastfeeding.
Recently, Scientists identified a protein in breast milk that suppresses the virus, the protein may even protect babies from become infected. Now, Experts say the discovery could lead to new ways to protect babies whose mothers are infected with HIV.
FILE - Breastfeeding
To prevent Infection, doctors give Anti-retroviral drugs to both mothers and their babies, that has greatly reduced the number of infections. But experts say that even without anti-AIDS drugs, only a small percentage of babies become infected through breast milk.
Sallie Permar is a professor of pediatrics and immunology at Duke University in North Carolina. She says, breastfeed babies appear to resist infection.
"It is actually remarkable that despite the infant being exposed to the virus multiple times daily for up to two years of their life, actually only 10 percent of those babies will become infected," said Permar.
The low rate of the infection was of great interest to researchers, including Sallie Permar. She led an effort to identify a substance in breast milk that may protect babies from infection.
Her team directed its attention to a protein called Tenacin-C, also called TNC. It is known to be involved in the process of healing wounds. But what purpose it serves in breast milk is not known.
The researchers exposed the TNC protein from breast milk of uninfected women to HIV, the protein linked up to the virus and made it harmless.
Antiretroviral drugs remain effective in limiting the passing of HIV from mother to baby. But professor Permar and her team suggest the TNC could be used in places where costly drug treatments are often not available.
"The issues are access to the drugs as well as monitoring. There are issues of toxicity and anti-retroviral drug resistance. And so we think alternative strategies may be needed to completely eliminate infant transmission," she Permar.
She suggests that TNC could be given to babies before breastfeeding to provide additional protection against HIV. She adds that the protein is safe, because it is already in natural part of human milk. This may avoid the problem of HIV become resisted to Antiretroviral drugs.
The team reported its findings in the journal Proceedings of the National Academy of Sciences.
And that is the Health Report from VOA Learning English. I'm June Simms.
译文属可可原创，仅供学习交流使用，未经许可请勿转载
词汇解释
1.breastfeeding n. 母乳哺育
Leading scientists claim breast-fed babies are intellectually brighter.
主流科学家宣称母乳喂养的婴儿更聪明。
2.anti-retroviral 抗逆转录病毒的
Anti - retroviral drugs can extend life for many years.
抗逆转录病毒药物能够使生命延长多年。
3.pediatrics n. 小儿科
He received a Bachelor's drgee of Pediatrics.
他获得了小儿科学士学位。
4.immunology n. [免疫] 免疫学
Tumor immunology and immunotherapy are but one of the exciting areas in cancer research.
肿瘤免疫学与免疗不过是癌瘤研究中这些鼓舞人心的领域之一。
5.toxicity n. [毒物] 毒性
substances with high levels of toxicity
毒性大的物质
内容解析
1.It is actually remarkable that despite the infant being exposed to the virus multiple times daily for up to two years of their life.
exposed to 接触；暴露于
The soldiers in the open field were exposed to the enemy's gunfire.
旷野中的士兵遭到敌人炮火的攻击。
The broken windows left us exposed to the sub - zero temperatures.
破窗子使我们置身于零下温度的严寒之中。
2.The researchers exposed the TNC protein from breast milk of uninfected women to HIV, the protein linked up to the virus and made it harmless.
link up 会合；连接；联系
They have planned to link up the two areas by telephone.
他们计划用电话把两个地区连接起来。
Engineers can link up distant countries by radio or telephone.
工程师们用无线电或电话可把相距遥远的国家联系在一起。
参考译文
这里是美国之音慢速英语健康报道。
每年成千上万儿童感染上艾滋病，这些男孩女孩的母亲携带有艾滋病毒，即人体免疫缺损病毒。怀孕期和母乳期都可以感染该病毒。
最近科学家在母乳中发现一种能抑制这种病毒的蛋白质，这种蛋白质甚至能保护婴儿不受感染。现在，专家称这一发现将促进新方法的发现，来保护那些母亲携带艾滋病毒的婴儿。
为预防感染，医生们会给母亲和婴儿都提供抗逆转录病毒药物，这能大幅度降低感染的人数。但专家说即使没有抗艾滋病毒药物，那些母乳喂养的婴儿也只有很少一部分会感染上。
Sallie Permar是北卡罗来纳州杜克大学儿科和免疫学教授，她说母乳喂养的婴儿显然更能抵抗感染。
“即使婴儿在生命的两年内多次接触到艾滋病毒，事实上只有10%的婴儿感染上，这是令人吃惊的。”
这样的低感染率极大地吸引了包括Sallie Permar在内的研究者们，她负责一项研究，寻找母乳中能保护婴儿免受感染的物质。
她的团队开始注意到一种名为TNC的蛋白质，据悉这种物质有助于伤口愈合。但它在母乳中发挥的作用尚不清楚。
研究者将未感染母亲母乳中的TNC蛋白质和艾滋病毒放一起，这种蛋白质和病毒连接起来并使得病毒变得无害。
抗逆转录病毒药物在限制艾滋病毒从母体传给婴儿方面仍有效，但Permar专家和她的团队称可在无法得到最昂贵的药物治疗时使TNC。
“问题是获得药物和检测的问题，还有毒性和抗逆转录药物的抗药性问题，所以我们认为需要采取其他的办法来彻底消除婴儿传染。”
她说TNC可在母乳之前给婴儿服用，来提供额外的对抗艾滋病毒的保护。她说这种蛋白质很安全，因为它是母乳的天然成分，这就可以避免出现艾滋病对抗逆转录药物产生抗药性的问题。
他的团队在杂志《美国国家科学院院刊》上发表了这一发现。
这里是美国之音慢速英语健康报道，我是琼·西姆斯。
