Interesting read........25 Nov 2020 06:59
extract from Science paper in Germany.......
"..............Significance Statement: Mitigating the spread of Covid-19 is the objective of most governments
of this world. It is of utmost importance to understand how effective various public health
measures are. We study the effectiveness of face masks. We employ public regional data about
reported SARS-CoV-2 infections for Germany. As face masks became mandatory at different
points in time across German regions, we can employ statistical methods to compare the rise in
infections in regions with masks and regions without masks. Weighing various estimates, we
conclude that 20 days after becoming mandatory, face masks have reduced the number of new
infections by around 45%. As economic costs are close to zero compared to other public health
measures, masks seem to be a cost-effective means to combat Covid-19.........."