A Vaccine From The 1920s Is Now Being Tested For Use Against The Coronavirus Pandemic
https://www.forbes.com/sites/ericmack/2020/03/31/a-vaccine-from-the-1920s-could-help-fight-the-coronavirus-pandemic/
Researchers in a handful of countries are testing a century-old tuberculosis vaccine to see if it can give a boost to the immune system to help it fight off the novel coronavirus now causing the COVID-19 pandemic.
Clinical trials of the Bacille Calmette-Guerin (BCG) vaccine, which was first developed in the early 1920s, are planned in Europe and Australia to see if it can help reduce the prevalence and severity of COVID-19 symptoms.
As a child, I got the BCG vaccine at school. The US has no history of regularly using BCG vaccinations.
A paper was published (
https://www.medrxiv.org/content/10.1101/2020.03.24.20042937v1 ) - that has yet to be peer reviewed - with data that seems to suggest countries that routinely did BCG vaccination and for a long continuous time have a lower rate of death.
This is not to say at this stage the BCG vaccine should be taken to prevent Covid-19 or to reduce symptoms. It's too early to tell. It might pan out to nothing, but that's what research is all about.