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Tianjin's thorough investigation link to pig heads from North America
Published on: 2020-11-25
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The recent COVID-19 infections in Tianjin have two sources, with one related to frozen pig heads imported from North America, Zhang Ying, a deputy director of Tianjin diseases control and prevention center, told a press conference on Tuesday.
 

Zhang noted that they received reports from Dezhou of Shandong that a batch of pork knuckles imported from Germany via a port in Tianjin was coronavirus-positive. Tianjin then screened Hailian cold storage and found two confirmed cases.
 

According to thorough epidemiological investigations on the two cases, Tianjin found the source of the two infections could be traced to two batches of pig heads imported from North America, which were carried in and out by the same worker while wearing the same pair of gloves and clothes. The original source is likely the pig heads which then infected the pig knuckles, according to Zhang.
 

On November 20, four residents in the Kanhaixuan residential community in the city's Dongjianggang district reported to be confirmed cases of COVID-19. On November 9, a confirmed case working in a Hailian cold storage in Beinhai New Area had been reported.
 

There are no links between the two infections, but share similarities - all infections happened in the Binhai New Area, and all the sources are imported cold chain products. People working in the field were first exposed to the virus, Zhang told the press conference.
 

The differences lie in the virus strain via virus sequencing and transmission patterns - one virus strain is the L genotype of the European branch I and the other is from North America.
 

The source of the Hailian cold storage is frozen pig heads imported from North America. Zhang explained how two working staff who had contacts with the pig heads were infected.
 

Based on closed-circuit videos in buildings of the Kanhai residential community, confirmed cases entered elevators coughing and wearing no masks, which may have spread the virus, according to Zhang.
 

北美猪头!

11月24日,在第155场天津市新型冠状病毒肺炎疫情防控工作新闻发布会上,天津市疾控中心副主任张颖介绍了天津海联冷库的疫情源头:北美猪头!
 

张颖表示,海联冷库与瞰海轩的疫情没有关联性,是两起独立的发病。判断的依据不单纯是从地理位置、人员的联系,更重要的是病毒的基因。
 

海联冷库经过粗测序,它的病毒基因属于L基因型欧洲家系2分支,瞰海轩属于L基因型欧洲家系1分支,它们的上缘是一样的,就像家庭一样,是兄弟两个人是不同的两个分支,从基因测序上可以判断这两起疫情是完全没有关联性的。
 

张颖介绍,11月7日,山东省德州市通报从天津港转运到德州市一批德国进口猪肘,外包装检出核酸阳性。天津卫健委循着这根线对海联冷库进行了全员的排查,发现了138号病例和139号病例。
 

138号病例是个搬卸工,搬卸货物是德国的猪肘。
 

139号病例是运送货物的司机,运送的是北美猪头,但是他没运过德国猪肘。
 

11月4日是海联冷库的入库日,当天有三批货在不同的时间运到海联冷库,一批是德国猪肘,另外两批是北美猪头。这里面有一个关键性的人物是装卸工,138号病例,入库的猪肘是他搬卸的,同时入2号库猪头也是他搬卸的,但是入5号库的猪头他没有进行搬卸。
 

11月5日是三批货的出库日,德国的猪肘从4号库作业平台出来,搬卸工仍旧是138号病例,他搬运完2号库的猪头,转天照样穿着同样的衣服,戴着同样的手套,没有消毒,继续出库猪肘。有可能山东德州猪肘与外包装检测出来的阳性是通过搬卸工的衣服或者是手套外表的污染造成的。

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