Covid-19: four fifths of cases are asymptomatic, China figures indicate

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https://pubmed.ncbi.nlm.nih.gov/32241884/

https://www.bmj.com/content/369/bmj.m1375

 

2020 Apr 2;369:m1375.
 doi: 10.1136/bmj.m1375.

Covid-19: four fifths of cases are asymptomatic, China figures indicate

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