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Source for Study: pubmed.ncbi.nlm.nih.gov...
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.
None of the 455 contracted Covid-19.
It is noteworthy that all personnel working in ED must take medical protection – namely, using N95 mask, putting on isolation gown and wearing goggle.
The statistics of 35 patients are displayed in Table 2. All patients also wore masks except for eating or drinking and were admitted to infectious department for medical isolation.
In total, 196 family members were enrolled. The situation on wearing masks was the same as that in patients.
The limitation of our study is that there is only one case and lack of detailed information on family members quarantined locally.