Two academic hospitals in The Netherlands (Nijmegen and Utrecht) just got approval to experiment with using a tuberculosis vaccine (BCG) to try to better protect hospital workers against coronavirus.
I assume that "protect hospital workers" means something like decreasing the severity of the infection.
Apparently the BCG vaccine is known to stimulate the immune system. Given that information, how exactly will it "protect hospital workers"? With or without BCG vaccine, the immune system does not yet have the antibodies against the SARS-CoV-2 (2019-nCoV) coronavirus. So, will the immune system, after BCG vaccination, create more or better antibodies or generate them faster?
Update as of 19 April 2021: "Tuberculosis vaccine does not protect vulnerable elderly against COVID-19" (https://www.umcutrecht.nl/en/about-us/news/details/jan-18-tuberculosis-vaccine-does-not-protect-vulnerable-elderly-against-covid-19).