2004n-982 acquiredimmunodeficiencysyndrome administration adverseeffects aids(disease)inpregnancy aids(disease)inwomen breastfeeding child control decisionmaking diseasetransmission étatsunisd'amérique guideline gynecology healthandhygiene healthaspects hiv-1 hivinfections immunologicalaspects immunology infant infantnutritionalphysiologicalphenomena infants infections infectionsàvih infectious infectiousdiseasetransmission massscreening maternalhealthservices medical nutrition obstetrics organization pregnancy pregnancycomplications prenataldiagnosis prevention préventionetcontrôle transmission treatment unitedstates vertical