South AfricaAfricaFemininityHeart AuscultationLost to Follow-UpAfrica South of the SaharaInfluenzavirus CAfrican Continental Ancestry GroupHIV InfectionsSalmonellaAfrica, WesternAfrica, SouthernCD4 Lymphocyte CountSalmonella InfectionsAnti-HIV AgentsAfrica, EasternAntiretroviral Therapy, Highly ActiveAfrica, CentralUrban PopulationAfrica, NorthernViral LoadPrevalenceInfant, NewbornCohort StudiesRetrospective StudiesMalariaGuineaAsiaPhylogenyCameroon