BCG seems to prime the immune system in non-specific ways, although IIRC the exact mechanism is still not well understood. There is a trial in New Zealand, I t

BCG seems to prime the immune system in non-specific ways, although IIRC the exact mechanism is still not well understood. There is a trial in New Zealand, I think, to test whether it gives protection or not. Not sure if they'll be able to finish, given the virus was aggressively stomped there.