July 2021 marks the hundredth anniversary of the first vaccination of an infant with the BCG vaccine.

Although tuberculosis is still one of the ten leading causes of mortality worldwide, this vaccine, developed at the Institut Pasteur, led to a steep reduction in the number of cases. We take a look back at how the vaccine was discovered.

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(Photo : Infirmière vaccinant un bébé contre la tuberculose par le vaccin BCG à l'Institut Pasteur de Dakar en 1925.)