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La fameuse étude chinoise relevant des cas de contaminations dans un centre commercial a Wuhan.
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[QUOTE="compteblad, post: 16609573, member: 167672"] The mall has 8 floors above ground and several basement levels; floors B1 to 6 are commercial shopping space, and floor 7 contains shopping and office space. We created an illustration showing the floors where the eventual COVID-19 case-patients worked or shopped, along with dates of symptom onset, potential incubation periods, symptom durations, confirmed times of positive diagnosis, and times of discharge ([URL='https://wwwnc.cdc.gov/eid/article/26/6/20-0412_article#tnF1']Figure[/URL], panel A). Except for those who had been on floor 7, all other case-patients denied direct close contact with other case-patients. The possibility of customers being infected from other sources cannot be excluded. However, most customers reported early symptom onset in a concentrated time frame ([URL='https://wwwnc.cdc.gov/eid/article/26/6/20-0412_article#tnF1']Figure[/URL], panel B). We found no convincing evidence of definitive transmission pathways in this building. Patients A–G ([URL='https://wwwnc.cdc.gov/eid/article/26/6/20-0412_article#tnF1']Figure[/URL], panel A) worked in the same room on floor 7. Other case-patients who had been on other floors denied any direct contact with confirmed patients from floor 7, but they shared common building facilities (e.g., restrooms, elevators). Also, staff from floor 7 visited shops on other floors daily. Until now, no evidence has shown that SARS-CoV-2 can survive outside the body for long. However, Middle East respiratory syndrome coronavirus demonstrates high robustness and a strong capability to survive outside the body and can remain infectious for up to 60 minutes after aerosolization ([URL='https://wwwnc.cdc.gov/eid/article/26/6/20-0412_article#r4'][I]4[/I][/URL]). Hence, the rapid spread of SARS-CoV-2 in our study could have resulted from spread via fomites (e.g., elevator buttons or restroom taps) or virus aerosolization in a confined public space (e.g., restrooms or elevators). All case-patients other than those on floor 7 were female, including a restroom cleaner, so common restroom use could have been the infection source. For case-patients who were customers in the shopping mall but did not report using the restroom, the source of infection could have been the elevators. The Guangzhou Center for Disease Control and Prevention detected the nucleic acid of SARS-CoV-2 on a doorknob at a patient’s house ([URL='https://wwwnc.cdc.gov/eid/article/26/6/20-0412_article#r5'][I]5[/I][/URL]), but Wenzhou Center for Disease Control and Prevention test results for an environmental sample from the surface of a mall elevator wall and button were negative. We cannot exclude the possibility of unknown infected persons (e.g., asymptomatic carriers) spreading the virus. However, according to screening protocols implemented by the Wenzhou Center for Disease Control and Prevention, we traced all close contacts and included all patients with positive PCR results, including the asymptomatic carrier (patient A), in this study. Our findings appear to indicate that low intensity transmission occurred without prolonged close contact in this mall; that is, the virus spread by indirect transmission. Dr. Cai is deputy chief physician and deputy director of the comprehensive internal medicine department. Her major research interest focuses on infectious diseases and gastrointestinal diseases. [/QUOTE]
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La fameuse étude chinoise relevant des cas de contaminations dans un centre commercial a Wuhan.
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