Recently a number of publications looked at the association between COVID-19 morbidity and mortality on one hand and countries ' policies with respect to BCG vaccination on the other .
This connection arises from differences in the rates of infection in countries
Recently a number of publications looked at the association between COVID-19 morbidity and mortality on one hand and countries ' policies with respect to BCG vaccination on the other .
This connection arises from differences in the rates of infection in countries where BCG vaccination is mandatory compared to countries where mandatory vaccination no longer exists or was never implemented in the first place .