[1] Johns Hopkins Univ, Sch Med, Div Infect Dis, Baltimore, MD 21205 USA
[2] PneumoADIP, Global Alliance Vaccines & Immunizat, Baltimore, MD USA
[3] Univ Colorado, Hlth Sci Ctr, Vet Affairs Med Ctr, Div Infect Dis,Colorado Ctr AIDS Res, Denver, CO USA
[4] Univ Stellenbosch, Dept Paediat & Child Hlth, Cape Town, South Africa
[5] Tygerberg Childrens Hosp, Cape Town, South Africa
[6] Makerere Univ, Dept Paediat & Child Hlth, Kampala, Uganda
[7] Univ Kwazulu Natal, Nelson Mandela Sch Med, Doris Duke Med Res Inst, Kwazulu, Eswatini