Three mother-baby pairs with invasive meningococcal disease occurred over 7 months in Western Australia, Australia, at a time when serogroup W sequence type 11 clonal complex was the predominant local strain. One mother and 2 neonates died, highlighting the role of this strain as a cause of obstetric and early neonatal death.
Keywords: Australia; IMD; Neisseria meningitidis; Western Australia; bacteria; clonal complex; cluster; invasive meningococcal disease; neonatal; newborn; obstetric; perinatal death; pregnancy; pregnant women; sequence type 11; serogroup W.