Lancet Microbe. 2024 Apr 25:S2666-5247(24)00038-7. doi: 10.1016/S2666-5247(24)00038-7. Online ahead of print. ABSTRACT BACKGROUND: Group B streptococcus is a major cause of neonatal disease. Natural history studies have linked maternally transferred anti-group B streptococcus capsular polysaccharide antibodies with protection against infant group B streptococcus disease. Previous studies of capsular polysaccharide antibody…