A new vaccine allows pneumonia-causing bacteria to colonize inside the body, activating only if the bacteria pose a threat. The approach, coupled with the vaccine’s potential to counteract more than 90 strains of the bacteria, could change how vaccines have worked since the days of Louis Pasteur.

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A new vaccine allows pneumonia-causing bacteria to colonize inside the body, activating only if the bacteria pose a threat. The approach, coupled with the vaccine’s potential to counteract more than 90 strains of the bacteria, could change how vaccines have worked since the days of Louis Pasteur.