中国疾控中心病毒病所专家：新发地病毒来自欧洲，但比欧洲现在流行的病毒要老

6月11日，北京在连续57天无新增本地确诊病例后，再次出现本地病例。突如其来的新冠病毒究竟来自何方，受到各方关注。

19日，中央纪委国家监委网站发布《三进新发地，中国疾控中心病毒病所发现了什么？》一文。文章报道称，在继14日、15日两次进入新发地农产品批发市场进行病毒采样后，中国疾控中心病毒病所（以下简称病毒病所）的专家于17日第三次进入新发地开展病毒溯源工作，并有了新的发现。

经初步研究发现：北京新发地的新冠病毒来自欧洲，但比当下欧洲流行的病毒要老。

The novel coronavirus detected in Beijing's recent outbreak at Xinfadi market has European origin, but is not completely the same as the European strain, said Chinese health officials. 

文章提到，确定病毒流行时间的早晚，目前主要采取的是基因组流行病学的方法。

病毒病所所长助理张勇表示，从基因组流行病学的初步研究结果看——“这个病毒是从欧洲来的，但是它跟欧洲当下流行的病毒又有一定差别，它比现在欧洲流行的病毒要老。”

"According to preliminary research results, the virus is from Europe, but it is different from the virus currently spreading in Europe," said Zhang Yong, assistant director at the National Institute for Viral Disease Control in an article published on the official website of China's Central Commission for Discipline Inspection on Friday.

"It's older than the virus that's currently spreading in Europe," he added.

这种老病毒是如何进入新发地市场的？张勇分析称，这其中涉及好几种可能性↓↓↓

“比如病毒潜伏在了进口的冷冻食品当中，在从境外到境内的整个存储、运输的期间，病毒由于被冷冻没有发生进化，所以它不会发生变异；也有可能病毒是在新发地农产品批发市场等阴暗潮湿的环境里潜伏下来，没有被消毒、灭菌，在一定时间内突然暴露感染人，导致进化速度变慢，最终我们看到的就是这些毒株更接近于欧洲老病毒。”

Zhang said there were several possibilities as to how the virus landed in China.

"It could have been hidden in imported frozen food products," he said, "or it was lurking in some dark and damp environment, such as the Xinfadi market, where it had not been properly disinfected and sterilized," he explained.

Food was stored frozen during transportation, which prevented the virus from mutating. That's why the virus found in Beijing is much closer to the original virus found in Europe, he noted.

张勇表示，虽然病毒的传播路径还有待更多的证据来证实或证伪，但基因组流行病学初步得出的这一推测，或许能够为综合运用流行病学调查、大数据技术等揭开新发地的病毒源头之谜提供有益的思路。

Laboratory tests and genome sequence analysis can help figure out the transmission routes, Zhang added.

一种在欧洲流行的老病毒，究竟是如何被带到北京新发地农产品批发市场的？科学家们还在日夜兼程地不懈探索。

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 北京新发地新冠疫情及病毒基因组序列数据公布 

与国际社会共享 

6月18日，中国疾病预防控制中心通过“新型冠状病毒国家科技资源服务系统”正式发布2020年6月北京新发地新冠疫情及病毒基因组序列数据。

与此同时，该中心还向世界卫生组织（WHO）及全球共享流感数据倡议组织（GISAID）提交了新冠疫情及病毒基因组序列数据，与国际社会共享研究成果。

China released the gene sequence data of the COVID-19 virus from Beijing's Xinfadi market infection cluster on Thursday, according to the Chinese Center for Disease Control and Prevention (CDC).

The Chinese CDC also submitted the genome sequencing data of the virus to the World Health Organization (WHO) and the Global Initiative on Sharing All Influenza Data (GISAID).

The information published on the website of state-backed National Microbiology Data Center on Friday shows the data is from two confirmed patients and one local environmental sample.

据北京卫健委消息，6月18日0时至24时，北京新增报告本地确诊病例25例、无症状感染者2例。自6月11日再次出现本地病例以来，北京8天内确诊病例已累计达183例。

Beijing reported 25 new confirmed domestically transmitted COVID-19 cases and two new asymptomatic cases on Thursday, the municipal health commission said Friday. So far, Beijing has reported a total of 183 cases since June 11, the day the city reported its first Xinfadi-related case.

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