claim: week-old vaccine investigates as a weapon against coronavirus
evidence_1: they will test whether a century- old vaccine against tuberculosis (tb), a bacterial disease, can rev up the human immune system in a broad way, allowing it to better fight the virus that causes coronavirus disease 2019 and, perhaps, prevent infection with it altogether.", "photo: afp [melbourne] a vaccine that's been used to prevent tuberculosis is being given to healthcare workers in melbourne to see if it will protect them against the coronavirus.")