Researchers studied a dangerous bacterial infection called Klebsiella pneumoniae that causes sepsis in newborns, particularly in sub-Saharan Africa where it is a major cause of death. They wanted to understand which parts of the bacteria the immune system recognizes, which could help develop a future vaccine.
The study involved 100 mother-baby pairs: 20 babies who developed K. pneumoniae sepsis and 80 healthy babies who did not. Scientists measured antibodies in breast milk, cord blood, and maternal blood against 161 different bacterial proteins. They found that certain proteins triggered antibody responses that were more common in mothers and babies who did not get sick.
This research is an important first step in identifying what a future vaccine might target. However, it is an observational study that shows an association, not proof that these antibodies cause protection. No vaccine was tested or given in this study. The findings point scientists toward specific proteins for further exploration in vaccine development, but much more research is needed.