Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Departments of Pediatrics and Microbiology & Molecular Genetics, Vaccine Testing Center, Larner College of Medicine, University of Vermont, Microbiology & Molecular Genetics, Vaccine Testing Center, Larner College of Medicine, University of Vermont, Department of Metabolism, Digestion and Reproduction, Division of Digestive Diseases, Faculty of Medicine, Imperial College London, Department of Metabolism, Digestion and Reproduction, Division of Digestive Diseases, Faculty of Medicine, Imperial College London, Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Cincinnati Children's Hospital Medical Center - Division of Infectious Diseases, Zvitambo Institute for Maternal and Child Health Research, Zvitambo Institute for Maternal and Child Health Research, Imperial College London - Department of Metabolism, Digestion and Reproduction, Johns Hopkins University - Bloomberg School of Public Health, University of Vermont - Department of Microbiology and Molecular Genetics, Johns Hopkins University - Department of International Health and Queen Mary University of London