A theory gaining currency in Russia is that people who were vaccinated for Tuberculosis, with a BCG shot, are maybe less susceptible to Covid-19. Russia is among the countries where the bulk of the population has received BCG & it& #39;s had only 8 reported coronavirus deaths, so far https://twitter.com/max_katz/status/1244211006206644224">https://twitter.com/max_katz/...