Maternal vaccination helps protect newborns from deadly bacterial bloodstream infections, mouse study suggests
Researchers at Washington University School of Medicine in St. Louis found that a vaccine given to pregnant mice protected their newborn pups from a severe bloodstream infection caused by Klebsiella pneumoniae, a dangerous bacterium that kills thousands of infants in low- and middle-income countries each year and is the leading killer of children globally.
A vaccine administered to pregnant mice effectively shielded their newborn offspring from a lethal bloodstream infection caused by Klebsiella pneumoniae, a highly dangerous bacterium that claims thousands of infant lives annually in low- and middle-income nations, according to researchers from Washington University School of Medicine in St. Louis.
The findings, published in Science Advances, highlight maternal immunization as a potential solution to protect vulnerable newborns from drug-resistant superbugs by leveraging maternal immunity. Klebsiella pneumoniae poses a significant threat to infants who have yet to develop their own immune systems, particularly in low-resource settings where children are frequently exposed to the bacterium in their environment, leading to severe bacterial blood infections known as sepsis.
The study, conducted in collaboration with the lab of Drew Schwartz, demonstrated that maternal immunization significantly improved survival rates in newborn mice exposed to lethal doses of K. pneumoniae K1 and K2 types, with over 80% of vaccinated pups surviving compared to 0% and under 35% survival rates in unvaccinated pups. The protective effect was attributed to the transfer of vaccine-specific antibodies from the vaccinated mother to her offspring via breast milk.
Researchers are now developing updated vaccines to target multiple strains of the superbug and are exploring the potential of this maternal vaccination strategy for human clinical trials to improve global health outcomes.
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