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Study reveals how long COVID-19 remains infectious on cardboard ...

Positivity     50%   
   Negativity   50%
The New York Times
SOURCE: https://www.sciencedaily.com/releases/2020/03/200320192755.htm
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Summary

19 hours ago ... The study's authors are from UCLA, the National Institutes of Health's National
Institute of Allergy and Infectious Diseases, the Centers for DiseaseĀ ...

As said here by https://www.sciencedaily.com/releases/2020/03/200320192755.htm