cited a publication
that appeared in 2008 in the British Journal of Medicine
in which the use of masks in interrupting the transmission of SARS (also a coronavirus)
had an effectiveness of 68%.
Hence, the use of masks was even more effective than frequent handwashing
(one of the current main strategies of the CDC and WHO).
Frequent handwashing had an effectiveness of 55%.
Even more impressive was that wearing an N95 mask had an effectiveness of 91%.
In a separate development, Gao Fu,
who is head of of the Chinese Center for Disease Control and Prevention,
in an interview with Science Magazine, bluntly said,
"In my opinion, one of the big mistakes made in Europe and America
is that people don't wear masks".
Given the experience that the Chinese have had in dealing with coronaviruses
and with covid-19 in particularly
and that China is the only country in the world that has been successful
in almost defeating the virus
(only about 3000 active cases remain after dealing with 80,000 cases),
we should value what the Chinese CDC says.
Date of update: 4/4/2020
Yesterday, the CDC announced a change in its recommendations:
People are encouraged to wear cloth face covers.
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