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| 1 | Cold-chain food contamination as the possible origin of COVID-19 resurgence in Beijing显示文摘COVID-19,caused by SARS-CoV-2[1,2],has been contained in China through stringent non-pharmaceutical interventions.Border control and quarantine have effectively prevented the virus from being spread by infected travellers,but the risk of resurgence caused by other routes of introduction and transmission remains unclear,and current strategies to prevent resurgence could be flawed.Since July,SARS-CoV-2 RNA contaminations in frozen food imported from countries with ongoing epidemics have been reported in nine provinces in China[3,4].However,there is no robust evidence of COVID-19 outbreaks initiated by environmentto-human transmission.Here we add to evidence of such transmission by investigating the recent COVID-19 resurgence in Beijing. | Xinghuo Pang Lili Ren Shuangsheng Wu Wentai Ma Jian Yang Lin Di Jie Li Yan Xiao Lu Kang Shichang Du Jing Du Jing Wang Gang Li Shuguang Zhai Lijuan Chen Wenxiong Zhou Shengjie Lai Lei Gao Yang Pan Quanyi Wang Mingkun Li Jianbin Wang Yanyi Huang Jianwei Wang COVID-19 Field Response Group COVID-19 Laboratory Testing Group | 2020 | National Science Review2020，7，12： | 51 |
| 2 | A Case of COVID-19-Tianjin Municipality, China, November 7, 2020显示文摘On November 7,2020,Tianjin Municipality received notification from Dezhou City,Shandong Province that specimens of the outer packaging of imported frozen pork products shipped from Germany via Tianjin Port were positive for coronavirus disease 2019(COVID-19)viral nucleic acid. | COVID-Field Response Group Laboratory Testing Group Yang Song Xiang Zhao Xiaoyan Li Wenbo Xu | 2020 | China CDC weekly2020，2，46： | 4 |
| 3 | The Source of Infection of the 137th Confirmed Case of COVID-19—Tianjin Municipality,China,June 17,2020显示文摘What is already known on this topic?Following 110 days of no new confirmed cases of COVID-19 in Tianjin Municipality,a case was confirmed on June 17,2020.A total of 136 local cases had been reported previously.What is added by this report?The 137th case was found in a dishwasher working in the western dining room of a hotel in Tianjin.Epidemiological investigations and laboratory research indicated that this case was likely transmitted from an asymptomatic individual that had recently visited several public places in Beijing Municipality and was working as a chef in the same workplace as the patient.Sequencing and analysis found that the COVID-19 virus genome found in the 137th case was 100%identical to sequences from the recent outbreak in Beijing’s Xinfadi Agricultural Product Wholesale Market.What are the implications for public health practice?A combination of meticulous epidemiological investigation and detailed laboratory research can promptly identify the source of COVID-19. | COVID-19 Field Response Group Laboratory Testing Group Ying Zhang | 2020 | China CDC weekly2020，2，27： | 4 |
| 4 | Investigation of Corrosion Resistance Using Positron Annihilation for an Amorphous Alloy显示文摘An amorphous alloy with Ni-(17-19) at. pct P prepared by electrodeposition process was studied using positron annihilation technique (PAT) associated with X-ray diffraction and the measurement of corrosion rate. It is suggested that defect or the interface between precipitates and matrix is one of the important factors which decrease corrosion resistance of the alloy after crystallization. | Jingcheng WANG, Fuqiang YOU,Junlin YIN and Guohua GAO Testing Center, Shanghai Iron & Steel Research Institute, Shanghai Bao Steel Group Corporation, Shanghai City Key Laboratory of Metal Functional Materials, Shanghai 200940, China | 2001 | Journal of Materials Science & Technology2001，17，4： | 0 |
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