Russell, Neal J;Seale, Anna C;O’Driscoll, Megan;O’Sullivan, Catherine;Bianchi-Jassir, Fiorella;Gonzalez-Guarin, Juan;Lawn, Joy E;Baker, Carol J;Bartlett, Linda;Cutland, Clare;Gravett, Michael G;Heath, Paul T;Le Doare, Kirsty;Madhi, Shabir A;Rubens, Craig E;Schrag, Stephanie;Sobanjo-ter Meulen, Ajoke;Vekemans, Johan;Saha, Samir K;Ip, Margaret;for the GBS Maternal Colonization Investigator Group;Asturias, Edwin;Gaind, Rajid;Kumar, Parveen;Anthony, Beena;Madrid, Lola;Bassat, Quique;Zhu, Chendi;Luo, Mingjing;Nagarjuna, Daram;Majumder, Subradeep;