www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

USEUROPEAFRICAASIA 中文雙語Fran?ais
World
Home / World / Americas

New method speeding progress on H7N9

Agencies | Updated: 2013-04-12 10:51

CHICAGO - ?Even as US officials this week awaited the arrival of a sample of the new bird flu virus from China - typically the first step in making a flu vaccine - government-backed researchers had already begun testing a "seed" strain of the virus made from the genetic code posted on the Internet.

This new, faster approach is the result of a collaboration among the US government, vaccine maker Novartis and a unit of the J. Craig Venter Institute, which is using synthetic biology - in which scientists take the genetic code of the virus and use it as a recipe to build the virus from scratch.

It was an idea born in the aftermath of the 2009 H1N1 pandemic, in which production delays and poor-quality seed strain slowed delivery of the vaccine until October, late enough that people were already sick with swine flu.

The new method has shaved two weeks off the vaccine-making process. It will take five to six months to ramp up production, but even weeks could make a difference in the case of a potentially deadly flu pandemic, said Robin Robinson, director of the Biomedical Advanced Research and Development Authority, an agency that falls under the US Department of Health and Human Services' Office of the Assistant Secretary for Preparedness and Response.

"We'll take it," Robinson said. "If the virus turns out to be a tough one, that could be very important."

So far, at least 33 people have been infected and 10 have died from the strain of bird flu known as H7N9 first found in humans last month.

When the genetic sequence for the virus became available on March 30, Robinson said, US health officials decided to try the new synthetic biology technique to try to speed the process. That's when Novartis and Venter's company, Synthetic Genomics Vaccines Inc, went to work. By Thursday, April 4, they had synthetic DNA ready and had started to grow the virus in dog kidney cells.

Mike Shaw, director of the US Centers for Disease Control and Prevention, said a sample of the virus arrived from China on Thursday afternoon.

That would normally be the starting point of making a seed vaccine. Scientists would take the sample, grow it and ensure it would grow well in chicken eggs or cells.

That involves a certain amount of guesswork, however. The new process of building the virus based on its genetic code allows "almost guaranteed success," Shaw said.

"That is because you're creating a virus that is almost tailor-made," he said.

Shaw said the CDC plans to take a vaccine candidate at least to the stage of human safety trials.

Most Viewed in 24 Hours
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 一级性片 | 久久高清免费视频 | 国产区一区二区三 | 欧美大胆a| 手机看片日本 | 日韩精品中文字幕在线观看 | 免费播放国产性色生活片 | 美女视频大全视频a免费九 美女视频大全网站免费 | 全免费a级毛片免费看不卡 全免费毛片在线播放 | 欧美精品做人一级爱免费 | 国产1级片 | 国产一区欧美二区 | 99在线视频免费 | 免费中国一级啪啪片 | 久草免费在线视频 | 国产一区曰韩二区欧美三区 | 欧美性精品videofree | 久草中文视频 | 日韩美女一级片 | 在线はじめてのおるすばん | 窝窝人体色 | 美女一级毛片毛片在线播放 | 亚洲第一狼人区 | 国产香蕉影视院 | 伊人久久91 | 毛片免费网址 | 国产精品久久久久久久y | 免费一区二区三区四区 | 欧美一级爱操视频 | 成 人 亚洲 综合天堂 | 国产一区二区三区在线观看视频 | 欧美日韩一二区 | 国产精品青草久久久久福利99 | 免费观看国产精品 | 国内欧美一区二区三区 | 精品亚洲成a人在线播放 | 国内精品伊人久久久久妇 | 国产成年人网站 | 久久精品国产一区二区三区不卡 | 成年人免费大片 | 久草综合在线观看 |