In one of our previous posts we wondered why there was such a big difference in mortality between Spain and Portugal *. Could this be the explanation?
This map shows different tuberculosis vaccination policies around the world. It shows a remarkable (but still to be verified) relationship with COVID-19 mortality.
source: https://www.medrxiv.org/content/10.1101/2020.03.24.20042937v1

Source: https://www.medrxiv.org/content/10.1101/2020.03.24.20042937v1