久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語Fran?ais
World
Home / World / Americas

Nature firms as source for open-minded experts

By MAY ZHOU in Houston | China Daily Global | Updated: 2021-07-30 09:41
Share
Share - WeChat
[Photo/Agencies]

US evolutionary biologist Michael Worobey has been firming up his opinion on the origins of the coronavirus since May, when he was among 17 scientists calling for an investigation that covered both natural source and lab-leak hypotheses.

Some two months after that appeal, published as a letter in the journal Science, the University of Arizona scientist said the newly emerging evidence has convinced him that natural origin is the more compelling explanation for the virus.

With this shift in thinking, Worobey joined 21 other scientists to publish a paper-The Origins of SARS-CoV-2: A Critical Review-in early July. "The most parsimonious explanation for the origin of SARS-CoV-2 is a zoonotic event," the scientists concluded, in referring to the name of the virus behind the pandemic. A zoonotic virus is one that crosses from animals to humans.

The authors of the review, led by Edward Holmes from the University of Sydney, are scientists from universities and research institutes in countries including the United States, the United Kingdom, New Zealand, Austria, Australia and China.

The May letter stated that in an investigation by the World Health Organization into the origins of the virus, there were no findings in clear support of either a natural spillover or a lab accident. They thought that the two theories weren't given balanced consideration and "we must take hypotheses about both natural and laboratory spillovers seriously until we have sufficient data".

The May letter was taken as evidence by some media that the scientists were advocating lab-leak theories. That's not what they meant, according to Worobey.

"Why am I on both papers? The answer is not that I've undergone a dramatic conversion. I've always thought a zoonotic emergence was more likely than a lab leak. In light of recent evidence/thinking, I simply view it as even more likely,"Worobey wrote on Twitter recently.

Pamela Bjorkman, a biology professor who also signed the May letter, recently wrote a letter to This Week in Virology and expressed her regret in signing the May letter.

Bjorkman said she signed the letter to prompt "more funding for searching for natural viruses in animal reservoirs".

"Perhaps naively, I did not anticipate that the letter would be used to promote the lab-origin hypothesis," she said. "I now think that I should have realized this would happen and should have been more proactive-either not signed the letter at all or else requested more wording changes to make my position clear."

Second thoughts

Worobey said a couple of things moved his thinking about the origin of COVID-19.

First, Shi Zhengli of the Wuhan Institute of Virology, or WIV, and other Chinese scientists recently published a paper concerning the genomes of several bat SARS-related coronaviruses from the same mine in Yunnan province where RaTG13-closest to SARS-CoV-2-came from. He found that the genomes turned out to be less close to SARS-CoV-2.

Another recently published study also helped to move Worobey's thinking. Xiao Xiao, Chris Newman and three other scientists traced animal sales from 17 shops in Wuhan's wet markets.

The study documented "47,381 individuals from 38 species, including 31 protected species sold between May 2017 and November 2019 in Wuhan's markets", according to the paper published in Nature.

Worobey said that traded animals such as raccoon dogs and civets are "plausible intermediate hosts".

Worobey told NPR that his colleague Robert Garry, a microbiologist at Tulane University, took data from the WHO and plotted it on a map showing where people with infections lived in Wuhan.

The data model shows that early COVID-19 cases in Wuhan started near the Huanan Seafood Wholesale Market. The map showed virtually no cases near the WIV, which is over 16 kilometers from the market.

"There are no cases around the WIV," Worobey said. "If the outbreak did start in the lab, the bottom line is, it would be odd for it not to be spreading from there rather than from elsewhere."

Most Viewed in 24 Hours
Top
BACK TO THE TOP
English
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: 国产成人一区二区三区精品久久 | 亚洲高清在线观看播放 | 国产成人精品aaaa视频一区 | 亚洲国产成人久久三区 | 中国内地毛片免费高清 | 在线观看的黄网 | 亚洲国产一级毛片 | 亚洲高清国产拍精品影院 | 欧美精品在欧美一区二区 | 日本一线a视频免费观看 | 成人自拍视频在线 | 日本特黄a级高清免费酷网 日本特黄特色 | 亚洲成a人不卡在线观看 | 欧美区一区二区三 | 日本一级毛片视频无遮挡免费 | 男人免费看片 | 日韩激情无码免费毛片 | 色吊丝在线观看国产 | 男女午夜性爽快免费视频不卡 | 99re在线精品视频 | 日本男人天堂 | 操爽视频 | 91精品视频免费 | 久久99久久精品免费思思6 | 亚洲天堂免费观看 | 久久免费手机视频 | 国产精品成人久久久久久久 | 亚洲男人在线天堂 | 久久看视频 | 国产成人精品综合网站 | 欧美大胆一级视频 | 加勒比在线免费视频 | 国产精自产拍久久久久久蜜 | 久久国产精品二国产精品 | 久久免费精品国产视频 | 我想看三级特黄 | 九九香蕉 | 亚洲精品国产成人7777 | 免费观看一级特黄欧美大片 | 无内丝袜透明在线播放 | 日韩精品中文字幕视频一区 |