Why a Century-Old Vaccine Offers New Hope Against Pathogens
In the early days of the Covid-19 pandemic, when prevention seemed light years away, several scientists launched trials to see whether a tuberculosis vaccine developed in the early 1900s might protect people by bolstering the immune system. The Bacillus-Calmette-Guerin vaccine has long been known to have broad effects on the immune system, and is still…
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