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.
Date of update: 6/2/2020
Two studies have been performed on the effectiveness of masks in the current situation:
is a cohort study of cases in Beijing.
The wearing of masks was found to reduce covid-19 transmission by a factor of 5!
The evidence is now compelling that people should be wearing masks when encountering others.
It is one weapon in the arsenal (other major ones include social-distancing and frequent hand-washing) against covid-19.
This update was prepared by the staff of Jupiter Scientific,
an organization devoted to the promotion of
science and scientific education through books, the internet
and other means of communication.
This web page may NOT be copied onto other web
sites, but other sites may link to this page.
People acting or using this information,
do so at their own risk.
Jupiter Scientific shall not be liable
to any individual or entity claiming damage or loss
by the contents of this report.