Very interesting listening.

Episode 56: Megan Murray A Massive Future for an Old Vaccine — After On
https://after-on.com/episodes-31-60/056

>Harvard epidemiologist Megan Murray has been studying tuberculosis for decades - as well as the "BCG" vaccine, which fights TB. BCG has been administered to more people than any other vaccine in history, it costs as little as 8¢ per dose, it's made by over 20 manufacturers across the globe, and has deep distribution channels in a majority of countries. This makes mounting evidence that it could be highly protective against Covid quite tantalizing.