the university of melbourne and murdoch children's research institute are studying a vaccine that works against tuberculosis, the bacillus calmette-guerin vaccine. it is a live-bacterium vaccine. the patiebt gets dead "mycobacterium tuberculosis" bacteria injected into them while training their immune system to fight it. over the years, scientists saw that the bacillus calmette-guerin vaccine did not only protect people from tuberculosis, but it protected them from other diseases too. the scientists at the murdoch children's research institute and university of melbourne are studying the bacillus calmette-guerin vaccine to see if it will protect people from covid-19. because this vaccine has already been used for other diseases for more than one hundred years, doctors already knew it was safe to use. as of july 2020, this vaccine is in phase iii trials to see if it works on covid-19.