*This may knock the struts out from beneath the claim that healthy* *people must wear masks. (We'd need a follow-up study to see if* *those contacts showed COVID-19 symptoms after five days.)*
*MCM* 2020 May 13;106026. doi: 10.1016/j.rmed.2020.106026. Online ahead of print. A Study on Infectivity of Asymptomatic SARS-CoV-2 Carriers Ming Gao <https://pubmed.ncbi.nlm.nih.gov/?term=Gao+M&cauthor_id=32405162> 1 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-1> , Lihui Yang <https://pubmed.ncbi.nlm.nih.gov/?term=Yang+L&cauthor_id=32405162> 2 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-2> , Xuefu Chen <https://pubmed.ncbi.nlm.nih.gov/?term=Chen+X&cauthor_id=32405162> 3 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-3> , Yiyu Deng <https://pubmed.ncbi.nlm.nih.gov/?term=Deng+Y&cauthor_id=32405162> 4 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-4> , Shifang Yang <https://pubmed.ncbi.nlm.nih.gov/?term=Yang+S&cauthor_id=32405162> 5 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-5> , Hanyi Xu <https://pubmed.ncbi.nlm.nih.gov/?term=Xu+H&cauthor_id=32405162> 5 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-5> , Zixing Chen <https://pubmed.ncbi.nlm.nih.gov/?term=Chen+Z&cauthor_id=32405162> 5 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-5> , Xinglin Gao <https://pubmed.ncbi.nlm.nih.gov/?term=Gao+X&cauthor_id=32405162> 5 <https://pubmed.ncbi.nlm.nih.gov/32405162/?fbclid=IwAR2xjKriW9Z8uqeUaXSl6b3gWcekNY3twOBEkCtNHwYCZ3M6d12yMGNKX0Y#affiliation-5> https://pubmed.ncbi.nlm.nih.gov/32405162/ Abstract *Background: *An ongoing outbreak of coronavirus disease 2019 (COVID-19) has spread around the world. It is debatable whether asymptomatic COVID-19 virus carriers are contagious. We report here a case of the asymptomatic patient and present clinical characteristics of 455 contacts, which aims to study the infectivity of asymptomatic carriers. *Material and methods: *455 contacts who were exposed to the asymptomatic COVID-19 virus carrier became the subjects of our research. They were divided into three groups: 35 patients, 196 family members and 224 hospital staffs. We extracted their epidemiological information, clinical records, auxiliary examination results and therapeutic schedules. *Results: *The median contact time for patients was four days and that for family members was five days. Cardiovascular disease accounted for 25% among original diseases of patients. Apart from hospital staffs, both patients and family members were isolated medically. During the quarantine, seven patients plus one family member appeared new respiratory symptoms, where fever was the most common one. The blood counts in most contacts were within a normal range. All CT images showed no sign of COVID-19 infection. No severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections was detected in 455 contacts by nucleic acid test. *Conclusion: **In summary, all the 455 contacts were excluded from SARS-CoV-2 infection and we conclude that the infectivity of some asymptomatic SARS-CoV-2 carriers might be weak.* -- If you appreciate News From Underground, please consider making a donation — either a one-time gift or a monthly subscription: http://markcrispinmiller.com/support/ Thank you for your support. Ways to unsubscribe: 1) send a blank email to [email protected] PLEASE NOTE: you must unsubscribe using the SAME email with which you subscribed 2) go to http://groups.google.com/group/newsfromunderground and click on the "Unsubscribe or change membership" link in the yellow bar at the top of the page, then click the "Unsubscribe" button on the next page. For more News From Underground, visit http://markcrispinmiller.com --- You received this message because you are subscribed to the Google Groups "News From Underground" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/newsfromunderground/CAGxB6W9pb6jCahT_qZ2GBfQvKFqAZ0Wms2d2DBsBSe7rPnOU2w%40mail.gmail.com.
