最后一次查出新冠病毒源头机会–世卫组织

The World Health Organization (WHO) says a new taskforce may be the last chance to find the origins of Covid-19.

It has nominated 26 experts to join the body, the Scientific Advisory Group on the Origins of Novel Pathogens (Sago).

（BBC news)More than a year-and-a-half since the virus was detected in the Chinese city of Wuhan, the question of how it first emerged remains unclear.

The team will consider if the virus jumped from animals to humans in Wuhan markets or leaked in a lab accident.

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China has strongly refuted the second theory.

In February, a WHO team tasked with investigating Covid's origins flew to China and concluded that the virus had probably come from bats but that more work was needed.

The team called the lab leak theory "extremely unlikely".


Video caption,
Covid-19 and Wuhan: Why don't we know more?

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But the WHO's director general, Dr Tedros Adhanom Ghebreyesus, later said the investigation had been hampered by a lack of data and transparency from China.

The proposed members of the Sago group include six experts who visited China as part of the previous team.

Aside from coronavirus, Sago will also look into the origins of other high-risk pathogens.

"Understanding where new pathogens come from is essential for preventing future outbreaks," said Dr Tedros said.

In a joint editorial in the journal Science, Dr Tedros and other WHO officials said "a lab accident cannot be ruled out".

EXPLAINER: Why the lab-leak theory is being taken seriously
Michael Ryan, the WHO's emergencies director, said Sago's work may be the "last chance to understand the origins of this virus".

The announcement of the new group comes as CNN reported that China was preparing to test tens of thousands of blood bank samples taken in the early months of the pandemic.

But Chen Xu, China's ambassador to the UN in Geneva, said Sago's work should not be "politicised".

"It is time to send teams to other places," he said.

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WHO caught up in geopolitical fight
Tulip Mazumdar, Global Health Correspondent

Almost two years since the start of the pandemic, we still don't know how or when the deadly Sars-Cov-2 virus emerged. Investigating new viruses is always extremely complex, but scientists have been able to find the source of the two previous coronavirus outbreaks - both of which have emerged from animals.

It's been nine months since the last WHO-convened mission returned from Wuhan, saying a similar animal spillover was the most likely source of the pandemic. But questions continue to be raised about a potential accident at a Wuhan lab which studies coronaviruses and keeps thousands of bat samples. China has strenuously denied this.

The WHO says China still hasn't shared crucial data from the earliest days of the pandemic. The UN agency - which has been caught in the firing line between China and the US's bigger geopolitical fight on this issue - has been hardening its language on investigations into a lab leak theory.

The science is becoming increasingly politicised, with China so far refusing to allow international scientists back into the country.

It's hoped this new Sago body with experts from 26 different countries will be able to break this impasse, and finally get some much needed answers so the world can better prepare for future outbreaks.

现在世卫想去中国武汉实验室进行第二次朔源调查，而习包皇拒绝。你这么一搞，此地无银三百两的痕迹就太明显了，如果真的像中共说的那样“病毒源头不是中国”，那你为什么不敢公开让世卫来查，现在连自己收买都小弟谭德塞都良心发现，不再听中共指使、要求调查了，你中共还有什么好说的？习近平这个蠢货根本不顾全人类福祉，如果他真的想打造“人类命运共同体“，就应该为全人类着想，查清根源，防止未来复发。他不是，他现在是把头埋进沙子里的鸵鸟，为了掩盖自己国家泄露病毒的罪行，拼命阻止找出真相，习就是个十恶不赦的杀人犯。